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Project website www.linuxfromscratch.org
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Source code repository git@git.linuxfromscratch.org:fr-lfs
Repository branch 11.3
Last remote commit Update translations for 11.3 6bfb71d1dc
Julien Lepiller authored a year ago
Last commit in Weblate Translated using Weblate (Portuguese (Brazil)) cbf53c9aef
User avatar jamenson authored a year ago
Weblate repository https://translate.linuxfromscratch.org/git/linux-from-scratch-11-3/index/
File mask blfs/*/postlfs/security/iptables.po
2 weeks ago

String statistics

Strings percent Hosted strings Words percent Hosted words Characters percent Hosted characters
Total 393 10,041 75,939
Source 131 3,347 25,313
Translated 100% 393 100% 10,041 100% 75,939
Needs editing 0% 0 0% 0 0% 0
Read-only 33% 131 33% 3,347 33% 25,313
Failing checks 1% 5 1% 140 1% 1,386
Strings with suggestions 0% 0 0% 0 0% 0
Untranslated strings 0% 0 0% 0 0% 0
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User avatar jamenson

Translation changed
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Begin /etc/systemd/scripts/iptables

echo
echo "You're using the example configuration for a setup of a firewall"
echo "from Beyond Linux From Scratch."
echo "This example is far from being complete, it is only meant"
echo "to be a reference."
echo "Firewall security is a complex issue, that exceeds the scope"
echo "of the configuration rules below."

echo "You can find additional information"
echo "about firewalls in Chapter 4 of the BLFS book."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insert iptables modules (not needed if built into the kernel).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Enable broadcast echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Disable Source Routed Packets
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Enable TCP SYN Cookie Protection
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Disable ICMP Redirect Acceptance
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Don't send Redirect Messages
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Drop Spoofed Packets coming in on an interface where responses
# would result in the reply going out a different interface.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Log packets with impossible addresses.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Be verbose on dynamic ip-addresses (not needed in case of static IP)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Disable Explicit Congestion Notification
# Too many routers are still ignorant
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Set a known state
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# These lines are here in case rules are already in place and the
# script is ever rerun on the fly. We want to remove all rules and
# pre-existing user defined chains before we implement new rules.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow local connections
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if the initiated on the intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Do masquerading
# (not needed if intranet is not using private ip-addresses)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# End /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Inicia /etc/systemd/scripts/iptables

echo
echo "Você está usando a configuração de exemplo para uma configuração de um firewall"
echo "oriunda do Beyond Linux From Scratch."
echo "Este exemplo está longe de ser completo; ele é entendido para ser"
echo "somente uma referência."
echo "A segurança do firewall é um problema complexo, que excede o escopo"
echo "das regras de configuração abaixo."

echo "Você pode encontrar informação adicional"
echo "acerca de firewalls no Capítulo 4 do livro BLFS."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insere módulos do iptables (não necessário se construído internamente ao núcleo).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Habilita difusão echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Desabilita Pacotes Fonte Roteados
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Habilitar Proteção de "Cookies" "SYN" do "TCP"
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Desabilitar Aceitação de Redirecionamento "ICMP"
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Não envia Mensagens de Redireção
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Descarta Pacotes Falsificados entrantes em uma interface, onde as
# respostas resultariam na resposta indo para uma interface diferente.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Registra pacotes com endereços impossíveis.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Seja verboso a respeito de endereços de IP dinâmicos (não necessário no caso de IP estático)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Desabilita a Notificação Explícita de Congestão
# roteadores demais ainda são ignorantes
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Configura um estado conhecido
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# Estas linhas estão aqui no caso das regras já estiverem no lugar e o script for
# mesmo reexecutado em tempo real. Nós queremos remover todas as regras e
# cadeias preexistentes definidas por usuário(a) antes de implementarmos novas regras.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Permite conexões locais
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Permite o encaminhamento se a iniciada na intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Faz o mascaramento (não necessário se a intranet não estiver usando
# endereços IP privados)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rulesRegistra tudo para depuração (última de todas as regras, porém antes
# das regras de política)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP ForwardingHabilita o Encaminhamento de IP
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# UnAs seções seguintes permitem pacotes de entrada para exemplos específicos;
# descomment the as linhas de example lines and adjust as necessary

# Allow ping on the exteremplo e ajuste conforme necessário

# Permite ping nal interface externa
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays withita pacotes idênticos com reconfiguração de TCP para evitar atrasos com o FTP oru o IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# AllowPermite HTTP ande HTTPS topara 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# Termina /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
a year ago
User avatar jamenson

Translation changed
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Begin /etc/systemd/scripts/iptables

echo
echo "You're using the example configuration for a setup of a firewall"
echo "from Beyond Linux From Scratch."
echo "This example is far from being complete, it is only meant"
echo "to be a reference."
echo "Firewall security is a complex issue, that exceeds the scope"
echo "of the configuration rules below."

echo "You can find additional information"
echo "about firewalls in Chapter 4 of the BLFS book."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insert iptables modules (not needed if built into the kernel).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Enable broadcast echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Disable Source Routed Packets
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Enable TCP SYN Cookie Protection
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Disable ICMP Redirect Acceptance
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Don't send Redirect Messages
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Drop Spoofed Packets coming in on an interface where responses
# would result in the reply going out a different interface.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Log packets with impossible addresses.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Be verbose on dynamic ip-addresses (not needed in case of static IP)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Disable Explicit Congestion Notification
# Too many routers are still ignorant
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Set a known state
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# These lines are here in case rules are already in place and the
# script is ever rerun on the fly. We want to remove all rules and
# pre-existing user defined chains before we implement new rules.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow local connections
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if the initiated on the intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Do masquerading
# (not needed if intranet is not using private ip-addresses)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# End /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Inicia /etc/systemd/scripts/iptables

echo
echo "Você está usando a configuração de exemplo para uma configuração de um firewall"
echo "oriunda do Beyond Linux From Scratch."
echo "Este exemplo está longe de ser completo; ele é entendido para ser"
echo "somente uma referência."
echo "A segurança do firewall é um problema complexo, que excede o escopo"
echo "das regras de configuração abaixo."

echo "Você pode encontrar informação adicional"
echo "acerca de firewalls no Capítulo 4 do livro BLFS."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insere módulos do iptables (não necessário se construído internamente ao núcleo).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Habilita difusão echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Desabilita Pacotes Fonte Roteados
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Habilitar Proteção de "Cookies" "SYN" do "TCP"
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Desabilitar Aceitação de Redirecionamento "ICMP"
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Não envia Mensagens de Redireção
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Descarta Pacotes Falsificados entrantes em uma interface, onde as
# respostas resultariam na resposta indo para uma interface diferente.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Registra pacotes com endereços impossíveis.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Seja verboso a respeito de endereços de IP dinâmicos (não necessário no caso de IP estático)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Desabilita a Notificação Explícita de Congestão
# roteadores demais ainda são ignorantes
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Configura um estado conhecido
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# Estas linhas estão aqui no caso das regras já estiverem no lugar e o script for
# mesmo reexecutado em tempo real. Nós queremos remover todas as regras e
# cadeias preexistentes definidas por usuário(a) antes de implementarmos novas regras.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow localPermite connectionexões locais
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if thePermite o encaminhamento se a initiated on theciada na intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# DFaz o masquerading
#caramento (nãot needed if intranet is not using private ip-addressecessário se a intranet não estiver usando
# endereços IP privados)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# Termina /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
a year ago
User avatar jamenson

Translation changed
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Begin /etc/systemd/scripts/iptables

echo
echo "You're using the example configuration for a setup of a firewall"
echo "from Beyond Linux From Scratch."
echo "This example is far from being complete, it is only meant"
echo "to be a reference."
echo "Firewall security is a complex issue, that exceeds the scope"
echo "of the configuration rules below."

echo "You can find additional information"
echo "about firewalls in Chapter 4 of the BLFS book."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insert iptables modules (not needed if built into the kernel).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Enable broadcast echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Disable Source Routed Packets
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Enable TCP SYN Cookie Protection
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Disable ICMP Redirect Acceptance
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Don't send Redirect Messages
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Drop Spoofed Packets coming in on an interface where responses
# would result in the reply going out a different interface.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Log packets with impossible addresses.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Be verbose on dynamic ip-addresses (not needed in case of static IP)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Disable Explicit Congestion Notification
# Too many routers are still ignorant
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Set a known state
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# These lines are here in case rules are already in place and the
# script is ever rerun on the fly. We want to remove all rules and
# pre-existing user defined chains before we implement new rules.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow local connections
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if the initiated on the intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Do masquerading
# (not needed if intranet is not using private ip-addresses)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# End /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Inicia /etc/systemd/scripts/iptables

echo
echo "Você está usando a configuração de exemplo para uma configuração de um firewall"
echo "oriunda do Beyond Linux From Scratch."
echo "Este exemplo está longe de ser completo; ele é entendido para ser"
echo "somente uma referência."
echo "A segurança do firewall é um problema complexo, que excede o escopo"
echo "das regras de configuração abaixo."

echo "Você pode encontrar informação adicional"
echo "acerca de firewalls no Capítulo 4 do livro BLFS."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insere módulos do iptables (não necessário se construído internamente ao núcleo).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Habilita difusão echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Desabilita Pacotes Fonte Roteados
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Habilitar Proteção de "Cookies" "SYN" do "TCP"
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Desabilitar Aceitação de Redirecionamento "ICMP"
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Não envia Mensagens de Redireção
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Descarta Pacotes Falsificados entrantes em uma interface, onde as
# respostas resultariam na resposta indo para uma interface diferente.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Registra pacotes com endereços impossíveis.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Seja verboso a respeito de endereços de IP dinâmicos (não necessário no caso de IP estático)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Disableesabilita a Notificação Expliícita de Congestion Notification
# Too many routers are stillão
# roteadores demais ainda são ignorantes
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Set a known stateConfigura um estado conhecido
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# These lines are here in case ruleEstas linhas estão aqui no caso das are already in place and the
# script is ever rerun on the fly. We want to remove all rules and
#gras já estiverem no lugar e o script for
# mesmo reexecutado em tempo real. Nós queremos remover todas as regras e
# cadeias pre-existing user defined chains before we implement new ruleentes definidas por usuário(a) antes de implementarmos novas regras.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow local connections
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if the initiated on the intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Do masquerading
# (not needed if intranet is not using private ip-addresses)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# Termina /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
a year ago
User avatar jamenson

Translation changed
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Begin /etc/systemd/scripts/iptables

echo
echo "You're using the example configuration for a setup of a firewall"
echo "from Beyond Linux From Scratch."
echo "This example is far from being complete, it is only meant"
echo "to be a reference."
echo "Firewall security is a complex issue, that exceeds the scope"
echo "of the configuration rules below."

echo "You can find additional information"
echo "about firewalls in Chapter 4 of the BLFS book."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insert iptables modules (not needed if built into the kernel).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Enable broadcast echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Disable Source Routed Packets
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Enable TCP SYN Cookie Protection
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Disable ICMP Redirect Acceptance
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Don't send Redirect Messages
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Drop Spoofed Packets coming in on an interface where responses
# would result in the reply going out a different interface.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Log packets with impossible addresses.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Be verbose on dynamic ip-addresses (not needed in case of static IP)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Disable Explicit Congestion Notification
# Too many routers are still ignorant
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Set a known state
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# These lines are here in case rules are already in place and the
# script is ever rerun on the fly. We want to remove all rules and
# pre-existing user defined chains before we implement new rules.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow local connections
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if the initiated on the intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Do masquerading
# (not needed if intranet is not using private ip-addresses)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# End /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Inicia /etc/systemd/scripts/iptables

echo
echo "Você está usando a configuração de exemplo para uma configuração de um firewall"
echo "oriunda do Beyond Linux From Scratch."
echo "Este exemplo está longe de ser completo; ele é entendido para ser"
echo "somente uma referência."
echo "A segurança do firewall é um problema complexo, que excede o escopo"
echo "das regras de configuração abaixo."

echo "Você pode encontrar informação adicional"
echo "acerca de firewalls no Capítulo 4 do livro BLFS."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insere módulos do iptables (não necessário se construído internamente ao núcleo).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Habilita difusão echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Desabilita Pacotes Fonte Roteados
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Habilitar Proteção de "Cookies" "SYN" do "TCP"
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Desabilitar Aceitação de Redirecionamento "ICMP"
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Don't send Redirect MessagesNão envia Mensagens de Redireção
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Drop Spoofed Packets coming in on an interface where responses
# would result in the reply going out aescarta Pacotes Falsificados entrantes em uma interface, onde as
# respostas resultariam na resposta indo para uma interface different interface.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Log packets with impossible addresseRegistra pacotes com endereços impossíveis.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# BeSeja verbose on dynamic ip-addresseo a respeito de endereços de IP dinâmicos (nãot needed in case of static IPcessário no caso de IP estático)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Disable Explicit Congestion Notification
# Too many routers are still ignorant
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Set a known state
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# These lines are here in case rules are already in place and the
# script is ever rerun on the fly. We want to remove all rules and
# pre-existing user defined chains before we implement new rules.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow local connections
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if the initiated on the intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Do masquerading
# (not needed if intranet is not using private ip-addresses)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# Termina /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
a year ago
User avatar jamenson

Translation changed
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Begin /etc/systemd/scripts/iptables

echo
echo "You're using the example configuration for a setup of a firewall"
echo "from Beyond Linux From Scratch."
echo "This example is far from being complete, it is only meant"
echo "to be a reference."
echo "Firewall security is a complex issue, that exceeds the scope"
echo "of the configuration rules below."

echo "You can find additional information"
echo "about firewalls in Chapter 4 of the BLFS book."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insert iptables modules (not needed if built into the kernel).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Enable broadcast echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Disable Source Routed Packets
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Enable TCP SYN Cookie Protection
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Disable ICMP Redirect Acceptance
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Don't send Redirect Messages
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Drop Spoofed Packets coming in on an interface where responses
# would result in the reply going out a different interface.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Log packets with impossible addresses.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Be verbose on dynamic ip-addresses (not needed in case of static IP)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Disable Explicit Congestion Notification
# Too many routers are still ignorant
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Set a known state
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# These lines are here in case rules are already in place and the
# script is ever rerun on the fly. We want to remove all rules and
# pre-existing user defined chains before we implement new rules.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow local connections
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if the initiated on the intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Do masquerading
# (not needed if intranet is not using private ip-addresses)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# End /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Inicia /etc/systemd/scripts/iptables

echo
echo "Você está usando a configuração de exemplo para uma configuração de um firewall"
echo "oriunda do Beyond Linux From Scratch."
echo "Este exemplo está longe de ser completo; ele é entendido para ser"
echo "somente uma referência."
echo "A segurança do firewall é um problema complexo, que excede o escopo"
echo "das regras de configuração abaixo."

echo "Você pode encontrar informação adicional"
echo "acerca de firewalls no Capítulo 4 do livro BLFS."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insere módulos do iptables (não necessário se construído internamente ao núcleo).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Habilita difusão echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Desabilita Pacotes Fonte Roteados
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Enable TCP SYN Cookie ProtectionHabilitar Proteção de "Cookies" "SYN" do "TCP"
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Disable ICMP Redirect Acceptanceesabilitar Aceitação de Redirecionamento "ICMP"
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Don't send Redirect Messages
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Drop Spoofed Packets coming in on an interface where responses
# would result in the reply going out a different interface.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Log packets with impossible addresses.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Be verbose on dynamic ip-addresses (not needed in case of static IP)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Disable Explicit Congestion Notification
# Too many routers are still ignorant
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Set a known state
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# These lines are here in case rules are already in place and the
# script is ever rerun on the fly. We want to remove all rules and
# pre-existing user defined chains before we implement new rules.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow local connections
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if the initiated on the intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Do masquerading
# (not needed if intranet is not using private ip-addresses)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# Termina /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
a year ago
User avatar jamenson

Translation changed
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Begin /etc/systemd/scripts/iptables

echo
echo "You're using the example configuration for a setup of a firewall"
echo "from Beyond Linux From Scratch."
echo "This example is far from being complete, it is only meant"
echo "to be a reference."
echo "Firewall security is a complex issue, that exceeds the scope"
echo "of the configuration rules below."

echo "You can find additional information"
echo "about firewalls in Chapter 4 of the BLFS book."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insert iptables modules (not needed if built into the kernel).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Enable broadcast echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Disable Source Routed Packets
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Enable TCP SYN Cookie Protection
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Disable ICMP Redirect Acceptance
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Don't send Redirect Messages
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Drop Spoofed Packets coming in on an interface where responses
# would result in the reply going out a different interface.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Log packets with impossible addresses.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Be verbose on dynamic ip-addresses (not needed in case of static IP)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Disable Explicit Congestion Notification
# Too many routers are still ignorant
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Set a known state
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# These lines are here in case rules are already in place and the
# script is ever rerun on the fly. We want to remove all rules and
# pre-existing user defined chains before we implement new rules.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow local connections
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if the initiated on the intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Do masquerading
# (not needed if intranet is not using private ip-addresses)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# End /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Inicia /etc/systemd/scripts/iptables

echo
echo "Você está usando a configuração de exemplo para uma configuração de um firewall"
echo "oriunda do Beyond Linux From Scratch."
echo "Este exemplo está longe de ser completo; ele é entendido para ser"
echo "somente uma referência."
echo "A segurança do firewall é um problema complexo, que excede o escopo"
echo "das regras de configuração abaixo."

echo "Você pode encontrar informação adicional"
echo "acerca de firewalls no Capítulo 4 do livro BLFS."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insert iptables modules (not needed if built into the kernele módulos do iptables (não necessário se construído internamente ao núcleo).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Enable broadcastHabilita difusão echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Disable Sourcesabilita Pacotes Fonte Routed Packetados
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Enable TCP SYN Cookie Protection
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Disable ICMP Redirect Acceptance
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Don't send Redirect Messages
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Drop Spoofed Packets coming in on an interface where responses
# would result in the reply going out a different interface.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Log packets with impossible addresses.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Be verbose on dynamic ip-addresses (not needed in case of static IP)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Disable Explicit Congestion Notification
# Too many routers are still ignorant
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Set a known state
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# These lines are here in case rules are already in place and the
# script is ever rerun on the fly. We want to remove all rules and
# pre-existing user defined chains before we implement new rules.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow local connections
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if the initiated on the intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Do masquerading
# (not needed if intranet is not using private ip-addresses)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# Termina /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
a year ago
User avatar jamenson

Translation changed
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Begin /etc/systemd/scripts/iptables

echo
echo "You're using the example configuration for a setup of a firewall"
echo "from Beyond Linux From Scratch."
echo "This example is far from being complete, it is only meant"
echo "to be a reference."
echo "Firewall security is a complex issue, that exceeds the scope"
echo "of the configuration rules below."

echo "You can find additional information"
echo "about firewalls in Chapter 4 of the BLFS book."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insert iptables modules (not needed if built into the kernel).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Enable broadcast echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Disable Source Routed Packets
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Enable TCP SYN Cookie Protection
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Disable ICMP Redirect Acceptance
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Don't send Redirect Messages
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Drop Spoofed Packets coming in on an interface where responses
# would result in the reply going out a different interface.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Log packets with impossible addresses.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Be verbose on dynamic ip-addresses (not needed in case of static IP)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Disable Explicit Congestion Notification
# Too many routers are still ignorant
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Set a known state
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# These lines are here in case rules are already in place and the
# script is ever rerun on the fly. We want to remove all rules and
# pre-existing user defined chains before we implement new rules.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow local connections
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if the initiated on the intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Do masquerading
# (not needed if intranet is not using private ip-addresses)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# End /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Inicia /etc/systemd/scripts/iptables

echo
echo "Você está usando a configuração de exemplo para uma configuração de um firewall"
echo "oriunda do Beyond Linux From Scratch."
echo "Este exemplo está longe de ser completo; ele é entendido para ser"
echo "somente uma referência."
echo "A segurança do firewall é um problema complexo, que excede o escopo"
echo "das regras de configuração abaixo."

echo "You can find additional informatVocê pode encontrar informação adicional"
echo "aboutcerca de firewalls ino Chapter 4 of the BLFS bookítulo 4 do livro BLFS."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insert iptables modules (not needed if built into the kernel).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Enable broadcast echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Disable Source Routed Packets
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Enable TCP SYN Cookie Protection
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Disable ICMP Redirect Acceptance
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Don't send Redirect Messages
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Drop Spoofed Packets coming in on an interface where responses
# would result in the reply going out a different interface.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Log packets with impossible addresses.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Be verbose on dynamic ip-addresses (not needed in case of static IP)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Disable Explicit Congestion Notification
# Too many routers are still ignorant
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Set a known state
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# These lines are here in case rules are already in place and the
# script is ever rerun on the fly. We want to remove all rules and
# pre-existing user defined chains before we implement new rules.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow local connections
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if the initiated on the intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Do masquerading
# (not needed if intranet is not using private ip-addresses)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# Termina /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
a year ago
User avatar jamenson

Translation changed
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Begin /etc/systemd/scripts/iptables

echo
echo "You're using the example configuration for a setup of a firewall"
echo "from Beyond Linux From Scratch."
echo "This example is far from being complete, it is only meant"
echo "to be a reference."
echo "Firewall security is a complex issue, that exceeds the scope"
echo "of the configuration rules below."

echo "You can find additional information"
echo "about firewalls in Chapter 4 of the BLFS book."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insert iptables modules (not needed if built into the kernel).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Enable broadcast echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Disable Source Routed Packets
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Enable TCP SYN Cookie Protection
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Disable ICMP Redirect Acceptance
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Don't send Redirect Messages
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Drop Spoofed Packets coming in on an interface where responses
# would result in the reply going out a different interface.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Log packets with impossible addresses.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Be verbose on dynamic ip-addresses (not needed in case of static IP)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Disable Explicit Congestion Notification
# Too many routers are still ignorant
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Set a known state
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# These lines are here in case rules are already in place and the
# script is ever rerun on the fly. We want to remove all rules and
# pre-existing user defined chains before we implement new rules.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow local connections
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if the initiated on the intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Do masquerading
# (not needed if intranet is not using private ip-addresses)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# End /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Inicia /etc/systemd/scripts/iptables

echo
echo "You're using thVocê está usando a configuração de example configuration for a setup of aemplo para uma configuração de um firewall"
echo "fromoriunda do Beyond Linux From Scratch."
echo "This example is far from being complete, it is only meant"
echo "to be Este exemplo está longe de ser completo; ele é entendido para ser"
echo "somente uma referenceência."
echo "Firewall security is a complex issue, thatA segurança do firewall é um problema complexo, que exceeds the de o escopeo"
echo "of the configuration rules belowdas regras de configuração abaixo."

echo "You can find additional information"
echo "about firewalls in Chapter 4 of the BLFS book."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insert iptables modules (not needed if built into the kernel).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Enable broadcast echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Disable Source Routed Packets
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Enable TCP SYN Cookie Protection
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Disable ICMP Redirect Acceptance
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Don't send Redirect Messages
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Drop Spoofed Packets coming in on an interface where responses
# would result in the reply going out a different interface.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Log packets with impossible addresses.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Be verbose on dynamic ip-addresses (not needed in case of static IP)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Disable Explicit Congestion Notification
# Too many routers are still ignorant
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Set a known state
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# These lines are here in case rules are already in place and the
# script is ever rerun on the fly. We want to remove all rules and
# pre-existing user defined chains before we implement new rules.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow local connections
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if the initiated on the intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Do masquerading
# (not needed if intranet is not using private ip-addresses)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# Termina /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
a year ago
User avatar jamenson

Translation changed
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# Begin /etc/systemd/scripts/iptables

echo
echo "You're using the example configuration for a setup of a firewall"
echo "from Beyond Linux From Scratch."
echo "This example is far from being complete, it is only meant"
echo "to be a reference."
echo "Firewall security is a complex issue, that exceeds the scope"
echo "of the configuration rules below."

echo "You can find additional information"
echo "about firewalls in Chapter 4 of the BLFS book."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insert iptables modules (not needed if built into the kernel).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Enable broadcast echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Disable Source Routed Packets
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Enable TCP SYN Cookie Protection
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Disable ICMP Redirect Acceptance
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Don't send Redirect Messages
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Drop Spoofed Packets coming in on an interface where responses
# would result in the reply going out a different interface.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Log packets with impossible addresses.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Be verbose on dynamic ip-addresses (not needed in case of static IP)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Disable Explicit Congestion Notification
# Too many routers are still ignorant
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Set a known state
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# These lines are here in case rules are already in place and the
# script is ever rerun on the fly. We want to remove all rules and
# pre-existing user defined chains before we implement new rules.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow local connections
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if the initiated on the intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Do masquerading
# (not needed if intranet is not using private ip-addresses)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# End /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
<?dbfo keep-together="auto"?><userinput>install -v -dm755 /etc/systemd/scripts

cat &gt; /etc/systemd/scripts/iptables &lt;&lt; "EOF"
<literal>#!/bin/sh

# BeginInicia /etc/systemd/scripts/iptables

echo
echo "You're using the example configuration for a setup of a firewall"
echo "from Beyond Linux From Scratch."
echo "This example is far from being complete, it is only meant"
echo "to be a reference."
echo "Firewall security is a complex issue, that exceeds the scope"
echo "of the configuration rules below."

echo "You can find additional information"
echo "about firewalls in Chapter 4 of the BLFS book."
echo "https://www.&lfs-domainname;/blfs"
echo

# Insert iptables modules (not needed if built into the kernel).

modprobe nf_conntrack
modprobe nf_conntrack_ftp
modprobe xt_conntrack
modprobe xt_LOG
modprobe xt_state

# Enable broadcast echo Protection
echo 1 &gt; /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Disable Source Routed Packets
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_source_route

# Enable TCP SYN Cookie Protection
echo 1 &gt; /proc/sys/net/ipv4/tcp_syncookies

# Disable ICMP Redirect Acceptance
echo 0 &gt; /proc/sys/net/ipv4/conf/all/accept_redirects

# Don't send Redirect Messages
echo 0 &gt; /proc/sys/net/ipv4/conf/default/send_redirects

# Drop Spoofed Packets coming in on an interface where responses
# would result in the reply going out a different interface.
echo 1 &gt; /proc/sys/net/ipv4/conf/default/rp_filter

# Log packets with impossible addresses.
echo 1 &gt; /proc/sys/net/ipv4/conf/all/log_martians

# Be verbose on dynamic ip-addresses (not needed in case of static IP)
echo 2 &gt; /proc/sys/net/ipv4/ip_dynaddr

# Disable Explicit Congestion Notification
# Too many routers are still ignorant
echo 0 &gt; /proc/sys/net/ipv4/tcp_ecn

# Set a known state
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# These lines are here in case rules are already in place and the
# script is ever rerun on the fly. We want to remove all rules and
# pre-existing user defined chains before we implement new rules.
iptables -F
iptables -X
iptables -Z

iptables -t nat -F

# Allow local connections
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow forwarding if the initiated on the intranet
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD ! -i WAN1 -m conntrack --ctstate NEW -j ACCEPT

# Do masquerading
# (not needed if intranet is not using private ip-addresses)
iptables -t nat -A POSTROUTING -o WAN1 -j MASQUERADE

# Log everything for debugging
# (last of all rules, but before policy rules)
iptables -A INPUT -j LOG --log-prefix "FIREWALL:INPUT "
iptables -A FORWARD -j LOG --log-prefix "FIREWALL:FORWARD "
iptables -A OUTPUT -j LOG --log-prefix "FIREWALL:OUTPUT "

# Enable IP Forwarding
echo 1 &gt; /proc/sys/net/ipv4/ip_forward

# The following sections allow inbound packets for specific examples
# Uncomment the example lines and adjust as necessary

# Allow ping on the external interface
#iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT

# Reject ident packets with TCP reset to avoid delays with FTP or IRC
#iptables -A INPUT -p tcp --dport 113 -j REJECT --reject-with tcp-reset

# Allow HTTP and HTTPS to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 80 -j DNAT --to 192.168.0.2
#iptables -A PREROUTING -t nat -i WAN1 -p tcp --dport 443 -j DNAT --to 192.168.0.2
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 80 -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.2 --dport 443 -j ACCEPT

# EndTermina /etc/systemd/scripts/iptables</literal>
EOF
chmod 700 /etc/systemd/scripts/iptables</userinput>
a year ago
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