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	Linux From Scratch 12.3/chapter09_network — Chinese (Simplified Han script)	The files in <filename class="directory">/etc/sysconfig/</filename> usually determine which interfaces are brought up and down by the network script. This directory should contain a file for each interface to be configured, such as <filename>ifconfig.xyz</filename>, where <quote>xyz</quote> describes the network card. The interface name (e.g. eth0) is usually appropriate. Each file contains the attributes of one interface, such as its IP address(es), subnet masks, and so forth. The stem of the filename must be <emphasis>ifconfig</emphasis>.	负责网络的引导脚本通常根据 <filename class="directory">/etc/sysconfig</filename> 中配置文件的内容，启用或禁用网络接口。对于每个需要配置的网络接口，该目录中都应该包含一个文件，文件名类似 <filename>ifconfig.xyz</filename>，这里<quote>xyz</quote>应该能够描述该网卡。使用接口名 (如 eth0) 一般比较合适。文件内部是该网络接口的属性，如 IP 地址、子网掩码等。文件名必须以 <emphasis>ifconfig</emphasis> 开头。
	Linux From Scratch 12.3/chapter09_network — Chinese (Simplified Han script)	The interface names depend on the implementation and configuration of the udev daemon running on the system. The udev daemon for LFS (installed in <xref linkend="ch-system-udev"/>) will not run until the LFS system is booted. So the interface names in the LFS system cannot always be determined by running those commands on the host distro, <emphasis>even in the chroot environment</emphasis>.
	Linux From Scratch 12.3/chapter09_network — Chinese (Simplified Han script)	The values in italics must be changed in each file, to set the interfaces up correctly.	您必须修改每个文件中用斜体显示的设定值，使其与您的网络环境相匹配。
	Linux From Scratch 12.3/chapter09_network — Chinese (Simplified Han script)	If the <envar>ONBOOT</envar> variable is set to <literal>yes</literal> the System V network script will bring up the Network Interface Card (NIC) during the system boot process. If set to anything besides <literal>yes</literal>, the NIC will be ignored by the network script and will not be started automatically. Interfaces can be manually started or stopped with the <command>ifup</command> and <command>ifdown</command> commands.	如果 <envar>ONBOOT</envar> 变量被设置为<quote>yes</quote>，则 System V 网络脚本会在引导系统时启用该网络接口卡 (NIC)。如果设定的值不是 <quote>yes</quote>，网络脚本会忽略该 NIC，不自动启用它。您可以使用 <command>ifup</command> 和 <command>ifdown</command> 命令，手动启用或禁用网络接口。
	Linux From Scratch 12.3/chapter09_network — Chinese (Simplified Han script)	The <envar>PREFIX</envar> variable specifies the number of bits used in the subnet. Each segment of an IP address is 8 bits. If the subnet's netmask is 255.255.255.0, then it is using the first three segments (24 bits) to specify the network number. If the netmask is 255.255.255.240, the subnet is using the first 28 bits. Prefixes longer than 24 bits are commonly used by DSL and cable-based Internet Service Providers (ISPs). In this example (PREFIX=24), the netmask is 255.255.255.0. Adjust the <envar>PREFIX</envar> variable according to your specific subnet. If omitted, the PREFIX defaults to 24.	<envar>PREFIX</envar> 变量应该包含子网使用的 IP 地址位数。IP 地址中的每一段都是二进制为 8 位的数，如果子网掩码是 255.255.255.0，说明 IP 地址中前三段 (24 位) 表示子网编号。如果子网掩码是 255.255.255.240，则使用了前 28 位表示子网编号。子网前缀比 24 长的情况一般见于基于 DSL 或同轴电缆的 Internet 服务提供商 (ISP).在我们的例子中，子网掩码是 255.255.255.0。您应该根据您所处的子网调整 <envar>PREFIX</envar> 变量。如果不指定它，则它默认为 24。
	Linux From Scratch 12.3/chapter09_network — Chinese (Simplified Han script)	Configuring the System Hostname	配置系统主机名
	Linux From Scratch 12.3/chapter09_network — Chinese (Simplified Han script)	<replaceable>&lt;lfs&gt;</replaceable> needs to be replaced with the name given to the computer. Do not enter the Fully Qualified Domain Name (FQDN) here. That information goes in the <filename>/etc/hosts</filename> file.	<replaceable>&lt;lfs&gt;</replaceable> 需要被替换为赋予该计算机的名称。不要在这里输入全限定域名 (FQDN)，它应该被写入 <filename>/etc/hosts</filename> 文件。
	Linux From Scratch 12.3/chapter09_network — Chinese (Simplified Han script)	Decide on a fully-qualified domain name (FQDN), and possible aliases for use in the <filename>/etc/hosts</filename> file. If using static IP addresses, you'll also need to decide on an IP address. The syntax for a hosts file entry is:	选择一个全限定域名 (FQDN) 和可能的别名，以供 <filename>/etc/hosts</filename> 文件使用。如果使用静态 IP 地址，您还需要确定要使用的 IP 地址。hosts 文件条目的语法是：
	Linux From Scratch 12.3/chapter09_network — Chinese (Simplified Han script)	A valid private IP address could be 192.168.1.2.	有效的私网 IP 地址的一个例子是 192.168.1.1。与之对应的 FQDN 可以是 lfs.example.org。
	Linux From Scratch 12.3/chapter09_network — Chinese (Simplified Han script)	If the computer is to be visible to the Internet, a valid FQDN can be the domain name itself, or a string resulted by concatenating a prefix (often the hostname) and the domain name with a <quote>.</quote> character. And, you need to contact the domain provider to resolve the FQDN to your public IP address.
	Linux From Scratch 12.3/chapter09_network — Chinese (Simplified Han script)	Even if the computer is not visible to the Internet, a FQDN is still needed for certain programs, such as MTAs, to operate properly. A special FQDN, <literal>localhost.localdomain</literal>, can be used for this purpose.
	Linux From Scratch 12.3/chapter09_network — Chinese (Simplified Han script)	<userinput>cat &gt; /etc/hosts &lt;&lt; "EOF" <literal># Begin /etc/hosts 127.0.0.1 localhost.localdomain localhost 127.0.1.1 <replaceable>&lt;FQDN&gt;</replaceable> <replaceable>&lt;HOSTNAME&gt;</replaceable> <replaceable>&lt;192.168.1.2&gt;</replaceable> <replaceable>&lt;FQDN&gt;</replaceable> <replaceable>&lt;HOSTNAME&gt;</replaceable> <replaceable>[alias1] [alias2 ...]</replaceable> ::1 localhost ip6-localhost ip6-loopback ff02::1 ip6-allnodes ff02::2 ip6-allrouters # End /etc/hosts</literal> EOF</userinput>	<userinput>cat &gt; /etc/hosts &lt;&lt; "EOF" <literal># Begin /etc/hosts 127.0.0.1 localhost.localdomain localhost 127.0.1.1 <replaceable>&lt;FQDN&gt;</replaceable> <replaceable>&lt;HOSTNAME&gt;</replaceable> <replaceable>&lt;192.168.1.1&gt;</replaceable> <replaceable>&lt;FQDN&gt;</replaceable> <replaceable>&lt;HOSTNAME&gt;</replaceable> <replaceable>[alias1] [alias2 ...]</replaceable> ::1 localhost ip6-localhost ip6-loopback ff02::1 ip6-allnodes ff02::2 ip6-allrouters # End /etc/hosts</literal> EOF</userinput>
	Linux From Scratch 12.3/chapter09_network — Chinese (Simplified Han script)	The <replaceable>&lt;192.168.1.2&gt;</replaceable>, <replaceable>&lt;FQDN&gt;</replaceable>, and <replaceable>&lt;HOSTNAME&gt;</replaceable> values need to be changed for specific uses or requirements (if assigned an IP address by a network/system administrator and the machine will be connected to an existing network). The optional alias name(s) can be omitted.	其中 <replaceable>&lt;192.168.0.2&gt;</replaceable>，<replaceable>&lt;FQDN&gt;</replaceable>，以及<replaceable>&lt;主机名&gt;</replaceable> 的值需要为特定使用环境和需求进行修改(如果系统或网络管理员分配了 IP 地址，且本机将被连接到现有的网络中)。可以跳过别名 (alias)，它们不是必要的。