配置文件/etc/network/interfaces

# This file describes the network interfaces available on your system
# and how to activate them. For more information,see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet dhcp

查看手册man 5 interfaces

摘要

INTERFACES(5)                           File formats                           INTERFACES(5)

NAME
       /etc/network/interfaces - network interface configuration for ifup and ifdown

DESCRIPTION
       /etc/network/interfaces  contains network interface configuration information for the
       ifup(8) and ifdown(8) commands.  This is where you configure how your system is  con‐
       nected to the network.

The  file  consists of zero or more "iface","mapping","auto","allow-" and "source"
       stanzas. Here is an example.
       auto eth0
       allow-hotplug eth1

       source interfaces.d/machine-dependent

       source-directory interfaces.d

       mapping eth0
            script /usr/local/sbin/map-scheme
            map HOME eth0-home
            map WORK eth0-work

       iface eth0-home inet static
            address 192.168.1.1
            netmask 255.255.255.0
            up flush-mail

       iface eth0-work inet dhcp

       iface eth1 inet dhcp