Linux policy routing examples
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Public domain
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### Policy route based on source address using iproute alone

    ip route add default via 192.168.1.1 table 4
    ip rule  add from 172.16.0.0/24 table 4
    ip rule  add from 172.16.0.0/24 to 172.16.0.0/24 table main

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### Policy route ICMP protocol using iproute and iptables together
 
    ip rule  add fwmark 1 table 4
    ip route add default via 192.168.1.1 dev eth1 table 4
    iptables -t mangle -A PREROUTING -i eth0 -p icmp -j MARK --set-mark 1
    iptables -t nat -A POSTROUTING -o eth1 -p icmp -j SNAT --to 192.168.1.5

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### Policy route based on user id (uid)

_You could not check this policy route with ping command, because of setuid flag setting on ping binary file_

    ip rule add fwmark 1 table 4
    ip route add default via 192.168.1.1 dev eth1 table 4
    iptables -t mangle -A OUTPUT -m owner ! --uid-owner root -j MARK --set-mark 1
    iptables -t nat -A POSTROUTING -o eth1 -m owner ! --uid-owner root -j MASQUERADE

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_BY: Pejman Moghadam_  
_TAG: iproute, iptables, policy-route_  
_DATE: 2012-06-07 15:18:01_