/etc/network/interface
下面是我机器的interface
auto lo
iface lo inet loopback
auto em1
iface em1 inet dhcp
lo是本地回环的配置
em1是本地网络节点，当前设置的是dhcp联网方式，下面设置成静态联网。
auto em1
iface em1 inet static
address 192.168.81.222
gateway 192.168.81.1
netmask 255.255.255.0
network 192.168.81.0
broadcast 192.168.81.255
设置成静态
192.168.81.222
然后重启，或者是重启网络部分
sudo /etc/init.d/network restart
