Linux小課堂開課了(7)-三線IP刷路由-移動-聯通-電信

最近有客戶需求，要在服務器上安裝centos7
使用三線（移動-聯通-電信），三個網卡分別配置，需要三個IP都可以正常通信，因爲三個IP分別有各自的網關，直接配置，只能有一個IP可以正常通信，如此，就需要刷路由，直接將三個IP的網關都配置進去。目前三個IP的網關都是末尾爲.1。如下，是刷路由的配置。
1、在/etc/rc.local裏面加上
ip route replace default via 101.X.X.X dev em1
ip route replace default via 43.X.X.X dev em2
ip route replace default via 117.X.X.X dev em3
ip route flush table ctc
ip route add default via 101.X.X.1 dev em1 src 101.X.X.X table ctc proto static
ip rule add from 101.X.X.X table ctc
ip route flush table cnc
ip route add default via 43.X.X.1 dev em2 src 43.X.X.X table cnc proto static
ip rule add from 43.X.X.X table cnc
ip route flush table cmcc
ip route add default via 117.X.X.1 dev em3 src 117.X.X.X table cmcc proto static
ip rule add from 117.X.X.X table cmcc

2、在/etc/iproute2/rt_tables 裏面加上

252 cmcc
251 cnc
250 ctc

3、在/etc/init.d/networking 加上
ip route replace default via 101.X.X.X dev em1
ip route replace default via 43.X.X.X dev em2
ip route replace default via 117.X.X.X dev em3
ip route flush table ctc
ip route add default via 101.X.X.1 dev em1 src 101.X.X.X table ctc proto static
ip rule add from 101.X.X.X table ctc
ip route flush table cnc
ip route add default via 43.X.X.1 dev em2 src 43.X.X.X table cnc proto static
ip rule add from 43.X.X.X table cnc
ip route flush table cmcc
ip route add default via 117.X.X.1 dev em3 src 117.X.X.X table cmcc proto static
ip rule add from 117.X.X.X table cmcc
4、reboot一下
測試都可以正常通信

未完，待續~