我们经常有这样的需求， 服务器托管在机房，分配了一个外网IP，还想弄一个内网IP。怎么实现呢， 首先你需要有2块网卡(一般服务器主板都有2个集成网卡)。
- 第一步， 查看一下2块网卡是否已经识别， 命令 ： lspci | grep ‘Ethernet’ 或者在 lspci里面找。如果找到 2 个Ethernet Controller 就说明没问题了。
- 设置外网IP 给连接外网的网口， 假设是 eth0, 那么在ubuntu中 ， vim /etc/network/interfaces ， 增加类似如下的语句，
auto eth0
iface eth0 inet static
address 222.73.44.222
netmask 255.255.255.192
gateway 222.73.44.193在 centos里面 ， vim /etc/sysconfig/network-scripts/ifcfg-eth0 ， 形如
DEVICE=eth0
BOOTPROTO=none
HWADDR=00:15:17:9d:0f:51
ONBOOT=yes
NETMASK=255.255.255.128
IPADDR=61.129.52.159
GATEWAY=61.129.52.254
TYPE=Ethernet - 设置内网IP， 注意不能设置网关，否则会出问题， 只要 设置 IP 和 netmask就可以了， 在ubuntu中 ， vim /etc/network/interfaces ， 增加类似如下的语句，
auto eth1
iface eth1 inet static
address 192.168.0.222
netmask 255.255.255.0在 centos里面 ， vim /etc/sysconfig/network-scripts/ifcfg-eth1 ， 形如
DEVICE=eth1
BOOTPROTO=none
HWADDR=00:15:17:9d:0f:51
ONBOOT=yes
NETMASK=255.255.255.0
IPADDR=192.168.0.159
TYPE=Ethernet
然后重启网络就可以了, (ubuntu) sudo /etc/init.d/networking restart , (centos) /etc/init.d/network restart .
作者：yaozer 原文链接：ubuntu/centos 上的双网卡设置
欢迎转载, 非常感谢你能注明作者和原始出处。
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