1、设置里允许启用多个网络连接

2、修改interfaces配置文件

vim /etc/network/interfaces

vim /etc/network/interfaces

auto lo  
iface lo inet loopback 

auto eth0  
iface eth0 inet dhcp
  
auto eth0:0  
iface eth0:0 inet static  
address 172.16.74.221  
netmask 255.255.255.0  
gateway 172.16.74.1  
  
auto eth0:1  
iface eth0:1 inet static  
address 192.168.0.221  
netmask 255.255.255.0  
gateway 192.168.0.1