双线服务器的策略路由

      由于众所周知的网通、电信问题，需要在双线机房托管WEB服务器。网通与电信的用户在做DNS解析时获得各自对应的IP地址，从而实现WEB浏览者快速访问WEB Server。如果WEB Server本身要访问电信或网通的IP地址，那么怎么实现路由的自动选择呢？

      Linux系统发展的策略路由完全可以实现。首先设置系统的缺省路由为电信的网关地址，对网通做策略路由。方法如下：

1. 编辑/etc/iproute2/rt_table, 增加一个路由表名称：

$ cat /etc/iproute2/rt_tables
#
# reserved values
#
255     local
254     main
253     default
0       unspec
#
# local
#
#1      inr.ruhep
252     cnc

2. 编辑/etc/sysconfig/network-scripts/route-eth0为cnc这个路由表增加缺省路由:

$ cat /etc/sysconfig/network-scripts/route-eth0
default via 210.22.0.1 table cnc

3. 编辑/etc/sysconfig/network-scripts/rule-eth0设置规则，满足规则的IP包就会走cnc这个路由表的缺省路由:

$ cat /etc/sysconfig/network-scripts/rule-eth0
from 210.22.0.7 table cnc
to 58.16.0.0/16 table cnc
to 58.17.0.0/17 table cnc
to 58.17.128.0/17 table cnc
to 58.18.0.0/16 table cnc
to 58.19.0.0/16 table cnc
to 58.20.0.0/16 table cnc
to 58.21.0.0/16 table cnc
to 58.22.0.0/15 table cnc
to 58.100.0.0/15 table cnc
to 58.144.0.0/16 table cnc
to 58.240.0.0/15 table cnc
to 58.242.0.0/15 table cnc
to 58.244.0.0/15 table cnc
to 58.246.0.0/15 table cnc
to 58.248.0.0/13 table cnc
to 60.0.0.0/13 table cnc
to 60.8.0.0/15 table cnc
to 60.10.0.0/16 table cnc
to 60.11.0.0/16 table cnc
to 60.12.0.0/16 table cnc
to 60.13.0.0/18 table cnc
to 60.13.64.0/18 table cnc
to 60.13.128.0/17 table cnc
to 60.14.0.0/15 table cnc
to 60.16.0.0/13 table cnc
to 60.24.0.0/14 table cnc
to 60.28.0.0/15 table cnc
to 60.30.0.0/16 table cnc
to 60.31.0.0/16 table cnc
to 60.208.0.0/13 table cnc
to 60.216.0.0/15 table cnc
to 60.218.0.0/15 table cnc
to 60.220.0.0/14 table cnc
to 60.255.0.0/16 table cnc
to 61.48.0.0/14 table cnc
to 61.52.0.0/15 table cnc
to 61.54.0.0/16 table cnc
to 61.55.0.0/16 table cnc
to 61.133.0.0/17 table cnc
to 61.134.96.0/19 table cnc
to 61.134.128.0/18 table cnc
to 61.134.192.0/18 table cnc
to 61.135.0.0/16 table cnc
to 61.136.0.0/18 table cnc
to 61.136.64.0/18 table cnc
to 61.137.128.0/17 table cnc
to 61.138.0.0/18 table cnc
to 61.138.64.0/18 table cnc
to 61.138.128.0/18 table cnc
to 61.139.128.0/18 table cnc
to 61.148.0.0/15 table cnc
to 61.156.0.0/16 table cnc
to 61.158.0.0/17 table cnc
to 61.158.128.0/17 table cnc
to 61.159.0.0/18 table cnc
to 61.161.0.0/18 table cnc
to 61.161.128.0/17 table cnc
to 61.162.0.0/16 table cnc
to 61.163.0.0/16 table cnc
to 61.167.0.0/16 table cnc
to 61.168.0.0/16 table cnc
to 61.176.0.0/16 table cnc
to 61.179.0.0/16 table cnc
to 61.180.128.0/17 table cnc
to 61.181.0.0/16 table cnc
to 61.182.0.0/16 table cnc
to 61.189.0.0/17 table cnc
to 114.54.0.0/15 table cnc
to 114.132.0.0/16 table cnc
to 114.240.0.0/12 table cnc
to 116.2.0.0/15 table cnc
to 116.60.0.0/14 table cnc
to 116.69.0.0/16 table cnc
to 116.70.0.0/17 table cnc
to 116.90.184.0/21 table cnc
to 116.95.0.0/16 table cnc
to 116.112.0.0/14 table cnc
to 116.116.0.0/15 table cnc
to 116.194.0.0/15 table cnc
to 116.199.0.0/17 table cnc
to 116.214.32.0/19 table cnc
to 116.216.0.0/14 table cnc
to 116.242.0.0/15 table cnc
to 116.254.128.0/17 table cnc
to 116.255.128.0/17 table cnc
to 117.8.0.0/13 table cnc
to 117.74.64.0/20 table cnc
to 117.75.0.0/16 table cnc
to 117.76.0.0/14 table cnc
to 117.100.0.0/15 table cnc
to 117.121.0.0/17 table cnc
to 117.121.128.0/18 table cnc
to 118.24.0.0/13 table cnc
to 118.72.0.0/13 table cnc
to 118.80.0.0/15 table cnc
to 118.88.32.0/19 table cnc
to 118.88.64.0/18 table cnc
to 118.88.128.0/17 table cnc
to 118.102.16.0/20 table cnc
to 118.144.0.0/14 table cnc
to 118.192.0.0/14 table cnc
to 118.212.0.0/16 table cnc
to 118.244.0.0/14 table cnc
to 119.4.0.0/14 table cnc
to 119.32.0.0/14 table cnc
to 119.36.0.0/16 table cnc
to 119.37.0.0/17 table cnc
to 119.37.128.0/18 table cnc
to 119.38.128.0/18 table cnc
to 119.39.0.0/16 table cnc
to 119.40.0.0/18 table cnc
to 119.40.128.0/17 table cnc
to 119.42.0.0/19 table cnc
to 119.42.224.0/19 table cnc
to 119.48.0.0/13 table cnc
to 119.59.128.0/17 table cnc
to 119.62.0.0/16 table cnc
to 119.81.0.0/16 table cnc
to 119.108.0.0/15 table cnc
to 119.112.0.0/13 table cnc
to 119.148.160.0/20 table cnc
to 119.162.0.0/15 table cnc
to 119.164.0.0/14 table cnc
to 119.176.0.0/12 table cnc
to 119.232.0.0/15 table cnc
to 119.248.0.0/14 table cnc
to 120.0.0.0/12 table cnc
to 120.31.0.0/16 table cnc
to 120.80.0.0/13 table cnc
to 120.137.0.0/17 table cnc
to 121.16.0.0/13 table cnc
to 121.24.0.0/14 table cnc
to 121.28.0.0/15 table cnc
to 121.30.0.0/16 table cnc
to 121.31.0.0/16 table cnc
to 121.40.0.0/14 table cnc
to 121.51.0.0/16 table cnc
to 121.68.0.0/14 table cnc
to 121.89.0.0/16 table cnc
to 121.100.128.0/17 table cnc
to 121.196.0.0/14 table cnc
to 121.201.0.0/16 table cnc
to 122.0.128.0/17 table cnc
to 122.96.0.0/15 table cnc
to 122.102.0.0/20 table cnc
to 122.102.64.0/20 table cnc
to 122.136.0.0/13 table cnc
to 122.156.0.0/14 table cnc
to 122.192.0.0/14 table cnc
to 123.4.0.0/14 table cnc
to 123.8.0.0/13 table cnc
to 123.49.128.0/17 table cnc
to 123.56.0.0/13 table cnc
to 123.99.128.0/17 table cnc
to 123.112.0.0/12 table cnc
to 123.128.0.0/13 table cnc
to 123.138.0.0/15 table cnc
to 123.144.0.0/14 table cnc
to 123.148.0.0/16 table cnc
to 123.152.0.0/13 table cnc
to 123.176.80.0/20 table cnc
to 123.188.0.0/14 table cnc
to 123.196.0.0/15 table cnc
to 123.232.0.0/14 table cnc
to 123.253.0.0/16 table cnc
to 124.21.0.0/20 table cnc
to 124.21.16.0/20 table cnc
to 124.21.32.0/19 table cnc
to 124.21.64.0/18 table cnc
to 124.21.128.0/17 table cnc
to 124.42.0.0/17 table cnc
to 124.64.0.0/15 table cnc
to 124.66.0.0/17 table cnc
to 124.67.0.0/16 table cnc
to 124.88.0.0/16 table cnc
to 124.89.0.0/17 table cnc
to 124.89.128.0/17 table cnc
to 124.90.0.0/15 table cnc
to 124.92.0.0/14 table cnc
to 124.128.0.0/13 table cnc
to 124.160.0.0/16 table cnc
to 124.161.0.0/16 table cnc
to 124.162.0.0/16 table cnc
to 124.163.0.0/16 table cnc
to 124.164.0.0/14 table cnc
to 124.172.0.0/15 table cnc
to 124.240.128.0/18 table cnc
to 125.32.0.0/16 table cnc
to 125.33.0.0/16 table cnc
to 125.34.0.0/16 table cnc
to 125.35.0.0/17 table cnc
to 125.35.128.0/17 table cnc
to 125.36.0.0/14 table cnc
to 125.40.0.0/13 table cnc
to 125.211.0.0/16 table cnc
to 202.38.143.0/24 table cnc
to 202.74.8.0/21 table cnc
to 202.75.208.0/20 table cnc
to 202.96.0.0/18 table cnc
to 202.96.64.0/21 table cnc
to 202.96.72.0/21 table cnc
to 202.96.80.0/20 table cnc
to 202.97.128.0/18 table cnc
to 202.97.192.0/19 table cnc
to 202.97.224.0/21 table cnc
to 202.97.232.0/21 table cnc
to 202.97.240.0/20 table cnc
to 202.98.0.0/21 table cnc
to 202.98.8.0/21 table cnc
to 202.98.16.0/20 table cnc
to 202.99.0.0/18 table cnc
to 202.99.64.0/19 table cnc
to 202.99.96.0/21 table cnc
to 202.99.104.0/21 table cnc
to 202.99.112.0/20 table cnc
to 202.99.128.0/19 table cnc
to 202.99.160.0/21 table cnc
to 202.99.168.0/21 table cnc
to 202.99.176.0/20 table cnc
to 202.99.192.0/21 table cnc
to 202.99.200.0/21 table cnc
to 202.99.208.0/20 table cnc
to 202.99.224.0/21 table cnc
to 202.99.232.0/21 table cnc
to 202.99.240.0/20 table cnc
to 202.102.128.0/21 table cnc
to 202.102.136.0/21 table cnc
to 202.102.144.0/20 table cnc
to 202.102.160.0/19 table cnc
to 202.102.224.0/21 table cnc
to 202.102.232.0/21 table cnc
to 202.102.240.0/20 table cnc
to 202.106.0.0/16 table cnc
to 202.107.0.0/17 table cnc
to 202.108.0.0/16 table cnc
to 202.110.0.0/18 table cnc
to 202.110.64.0/18 table cnc
to 202.110.192.0/18 table cnc
to 202.111.128.0/19 table cnc
to 202.111.160.0/19 table cnc
to 202.122.128.0/24 table cnc
to 202.127.112.0/20 table cnc
to 202.127.194.0/23 table cnc
to 202.127.209.0/24 table cnc
to 202.130.224.0/19 table cnc
to 202.152.176.0/20 table cnc
to 203.93.8.0/24 table cnc
to 203.93.192.0/18 table cnc
to 203.135.160.0/20 table cnc
to 203.166.160.0/19 table cnc
to 210.13.0.0/18 table cnc
to 210.13.64.0/18 table cnc
to 210.13.128.0/17 table cnc
to 210.14.160.0/19 table cnc
to 210.14.192.0/19 table cnc
to 210.15.32.0/19 table cnc
to 210.15.96.0/19 table cnc
to 210.15.128.0/18 table cnc
to 210.21.0.0/17 table cnc
to 210.21.128.0/17 table cnc
to 210.22.0.0/16 table cnc
to 210.51.0.0/16 table cnc
to 210.52.0.0/18 table cnc
to 210.52.64.0/18 table cnc
to 210.52.128.0/17 table cnc
to 210.53.0.0/17 table cnc
to 210.53.128.0/17 table cnc
to 210.56.192.0/19 table cnc
to 210.74.96.0/19 table cnc
to 210.74.128.0/19 table cnc
to 210.78.0.0/19 table cnc
to 210.82.0.0/15 table cnc
to 211.103.128.0/17 table cnc
to 211.144.0.0/15 table cnc
to 218.7.0.0/16 table cnc
to 218.8.0.0/15 table cnc
to 218.10.0.0/16 table cnc
to 218.11.0.0/16 table cnc
to 218.12.0.0/16 table cnc
to 218.21.128.0/17 table cnc
to 218.24.0.0/15 table cnc
to 218.26.0.0/16 table cnc
to 218.27.0.0/16 table cnc
to 218.28.0.0/15 table cnc
to 218.56.0.0/14 table cnc
to 218.60.0.0/15 table cnc
to 218.62.0.0/17 table cnc
to 218.67.128.0/17 table cnc
to 218.68.0.0/15 table cnc
to 218.104.0.0/17 table cnc
to 218.104.128.0/19 table cnc
to 218.104.160.0/19 table cnc
to 218.104.192.0/21 table cnc
to 218.104.200.0/21 table cnc
to 218.104.208.0/20 table cnc
to 218.104.224.0/19 table cnc
to 218.105.0.0/16 table cnc
to 218.106.0.0/15 table cnc
to 219.154.0.0/15 table cnc
to 219.156.0.0/15 table cnc
to 219.158.0.0/17 table cnc
to 219.158.128.0/17 table cnc
to 219.159.0.0/18 table cnc
to 219.232.0.0/14 table cnc
to 220.112.0.0/14 table cnc
to 220.231.0.0/18 table cnc
to 220.242.0.0/15 table cnc
to 220.248.0.0/14 table cnc
to 220.252.0.0/16 table cnc
to 221.0.0.0/15 table cnc
to 221.2.0.0/16 table cnc
to 221.3.0.0/17 table cnc
to 221.3.128.0/17 table cnc
to 221.4.0.0/16 table cnc
to 221.5.0.0/17 table cnc
to 221.5.128.0/17 table cnc
to 221.6.0.0/16 table cnc
to 221.7.0.0/19 table cnc
to 221.7.32.0/19 table cnc
to 221.7.64.0/19 table cnc
to 221.7.96.0/19 table cnc
to 221.7.128.0/17 table cnc
to 221.8.0.0/15 table cnc
to 221.10.0.0/16 table cnc
to 221.11.0.0/17 table cnc
to 221.11.128.0/18 table cnc
to 221.11.192.0/19 table cnc
to 221.11.224.0/19 table cnc
to 221.12.0.0/17 table cnc
to 221.12.128.0/18 table cnc
to 221.13.0.0/18 table cnc
to 221.13.64.0/19 table cnc
to 221.13.96.0/19 table cnc
to 221.13.128.0/17 table cnc
to 221.14.0.0/15 table cnc
to 221.192.0.0/15 table cnc
to 221.194.0.0/16 table cnc
to 221.195.0.0/16 table cnc
to 221.196.0.0/15 table cnc
to 221.198.0.0/16 table cnc
to 221.199.0.0/19 table cnc
to 221.199.32.0/20 table cnc
to 221.199.48.0/20 table cnc
to 221.199.64.0/18 table cnc
to 221.199.128.0/18 table cnc
to 221.199.192.0/20 table cnc
to 221.199.224.0/19 table cnc
to 221.200.0.0/14 table cnc
to 221.204.0.0/15 table cnc
to 221.206.0.0/16 table cnc
to 221.207.0.0/18 table cnc
to 221.207.64.0/18 table cnc
to 221.207.128.0/17 table cnc
to 221.208.0.0/14 table cnc
to 221.212.0.0/16 table cnc
to 221.213.0.0/16 table cnc
to 221.214.0.0/15 table cnc
to 221.216.0.0/13 table cnc
to 222.128.0.0/14 table cnc
to 222.132.0.0/14 table cnc
to 222.136.0.0/13 table cnc
to 222.160.0.0/15 table cnc
to 222.162.0.0/16 table cnc
to 222.163.0.0/19 table cnc
to 222.163.32.0/19 table cnc
to 222.163.64.0/18 table cnc
to 222.163.128.0/17 table cnc
to 58.19.0.0/16 table cnc
to 60.220.0.0/14 table cnc
to 61.134.192.0/18 table cnc
to 116.2.0.0/15 table cnc
to 119.108.0.0/15 table cnc
to 119.112.0.0/13 table cnc
to 119.162.0.0/15 table cnc
to 119.164.0.0/14 table cnc
to 119.176.0.0/12 table cnc
to 123.188.0.0/14 table cnc
to 202.97.128.0/18 table cnc
to 202.98.16.0/20 table cnc
to 202.99.192.0/21 table cnc
to 202.99.208.0/20 table cnc
to 202.111.160.0/19 table cnc
to 218.62.0.0/17 table cnc
to 221.204.0.0/15 table cnc

 

做完上述3步后，执行网络重启命令就可以生效了。

$ sudo /sbin/service network restart

下面验证一下：

$ /sbin/ip route get 218.60.128.130
218.60.128.130 via 210.22.0.1 dev eth0  src 210.22.0.7
    cache  mtu 1500 advmss 1460 hoplimit 64
这说明如果目的IP是网通的IP话，系统会自动选择双线中的网通IP地址作为源地址，并且选择网通的路由。同样可以验证电信的目的IP路由选择也是正确的。