利用路由表设置多网卡默认路由

 

Example:

电信IP:1.1.1.2　　Gateway:1.1.1.1

联通IP:2.2.2.2　　Gateway:2.2.2.1

移动IP:3.3.3.2　　Gateway:3.3.3.1

 

1. 配置路由表字段
   

   vim /etc/iproute2/rt_tables
   
   #
   # reserved values
   #
   
   255        local
   254        main
   253        default
   0        unspec
   
   #
   # local
   #
   #1        inr.ruhep
   
   252        dx
   251        lt
   250        yd

    

2. 编写路由脚本
   

   vim route.sh
   
   #!/bin/env sh
   ip route flush table dx
   ip rule add from 1.1.1.2 table dx
   ip route add default via 1.1.1.1 dev eth0 src 1.1.1.2 table dx
   
   ip route flush table lt
   ip rule add from 2.2.2.2 table lt
   ip route add 0.0.0.0/0 via 2.2.2.1 dev eth1 src 2.2.2.2 table lt
   
   ip route flush table yd
   ip rule add from 3.3.3.2 table yd
   ip route add 0.0.0.0/0 via 3.3.3.1 dev eth2 src 3.3.3.2 table yd
   

    

3. 添加执行权限
   

   chmod +x route.sh /etc/rc.d/rc.local

    

4. 添加开机启动项
   

   echo "/root/route.sh" >> /etc/rc.d/rc.local

    

5. ip route flush table 100
   ip rule add from 1.1.1.2 table 100
   ip route add default via 1.1.1.1 dev em1 src 1.1.1.2 table 100 prio 50
   
   ip route flush table 200
   ip rule add from 2.2.2.2 table 200
   ip route add default via 2.2.2.1 dev em2 src 2.2.2.2 table 200 prio 50