1. 静态ip
编辑/etc/network/interfaces
auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 192.168.1.20 netmask 255.255.255.0 gateway 192.168.1.1 dns-nameservers 192.168.1.1
2. DHCP
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
3. 设置桥
原文：http://www.cnblogs.com/kramer/p/4409280.html