The Road goes ever on and on

# sudo gedit /etc/network/interfaces
auto eth0
iface eth0 inet static
address xxx.xxx.xxx.xxx #ip地址
netmask 255.255.255.0 #子网掩码
gateway xxx.xxx.xxx.xxx #网关

# sudo gedit /etc/resolv.conf
nameserver xxx.xxx.xxx.xxx
nameserver xxx.xxx.xxx.xxx #备用DNS