温故知新，ubuntu 11.10 server IP,mask,gateway,dns配置

配置文件为： /etc/network/interfaces

默认为dhcp配置

auto eth0 
iface eth0 inet dhcp 

手动设置ip,mask,gw

auto eth0 
iface eth0 inet static 
address 192.168.1.55 
netmask 255.255.255.0 
gateway 192.168.1.1 

dns在 /etc/resolv.conf中,
添加 nameserver xxx.xxx.xxx.xxx

重启服务生效

/etc/init.d/networking restart