方法一：
root@debian:~# vim.tiny /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information,see interfaces(5).
source /etc/network/interfaces.d/*
# The loopback network interface
auto eth0
iface eth0 inet static
address=192.168.2.100
netmask=255.255.255.0
gateway=192.168.2.254
输入x保存退出
修改DNS：#nano /etc/resolvconf/resolv.conf.d/base
nameserver 8.8.8.8
重启服务：/etc/init.d/networking restart
开启网卡：ifconfig eth0 up
