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hraphrap
Asked: 2013-09-11 03:06:59 +0800 CST

Forwarding local network interface on my server through NAT

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I have 3 interfaces on my server,

  • first is used for the local network,
  • second and third are internet connections (each has its own ip routing table).

How can i force server daemons and command line tools use first interface to create outgoing connections. I want use same iptables nat and filter rules for my server that i use for other machines of my network.

eth0 192.168.0.1
eth1 9.9.9.9
eth2 9.9.9.10

I don't know why it uses eth1 for outgoing connections now.

routing

1 Answers

  1. Best Answer

    If you run 

    ip route

    It will give you results similar to the following:

    default via 192.168.0.10 dev eth0  metric 2
127.0.0.0/8 via 127.0.0.1 dev lo
192.168.0.0/24 dev eth0  proto kernel  scope link  src 192.168.0.106  metric 2

    As you can see from the above output, any traffic which goes via the default route will go via eth0

    So it sounds like you need to do something like this:

    ip route delete default via <ip> dev eth1

    then

    ip route add default via <ip> dev eth0

    How you make this change permanent will depend on your distro.

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