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user4514
Asked: 2011-08-02 00:38:40 +0800 CST

Linux: Ip forwarding or bridge?

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On a Ubuntu 8.04 I have two interfaces eth3 and eth4:avahi.

eth3 is in my local network with 192.168.178.63.
eth4:avahi has the ip 85.214.144.211.

From this box I can ping 85.214.144.212 successfully.

On a windows box in the same local network with ip 192.168.178.61 I want also be able to reach 85.214.144.212. To achieve this I used the following steps:

  1. On the windows machine I entered 192.168.178.63 as gateway.
  2. On the Ubuntu I activated /proc/sys/net/ipv4/ip_forwarding

Now on the windows machine I can ping 85.214.144.211 but not ping 85.214.144.212.

What I am doing wrong?

router linux ip-forwarding

2 Answers

  1. Best Answer

    Reason: 85.214.144.212 don't know route to 192.168.178.0/24 network.
    1. Add route to 192.168.178.0/24 network on 85.214.144.212-box.
    2. Use NAT on Ubuntu_8.04.

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  2. I don't know what an OpenVZ-guest is, but if it is a host on the Internet then you will have to use network address translation (NAT) on your Ubuntu host because 192.168.x.y addresses are not routable beyond your local network.

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