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I'm using OpenVPN on Ubuntu Server to connect to my VPN. That network interface is tun0. All traffic currently goes through the VPN. I'd like to exclude traffic that goes over a specific port, and have that traffic go through eth0, and not through the VPN. I know it's possible, but I don't have much networking experience, so I'm at a loss here. Any help is much appreciated.

  • Do you want general tips or specific steps? I can do the former. – Otheus May 12 '15 at 22:27
  • Thanks Otheus, I'm mostly looking for specific tips, but general tips might point me in the right direction in where to search. Thanks! – Randy May 12 '15 at 22:34
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You can use iptables + ip-route together to achieve this. The idea is, iptables "mangles" a specified packet by "marking it", and then later, the ip route rules can direct such marked packets to a different gateway, ie, interface. I found a concise and simple example for you: http://lartc.org/howto/lartc.netfilter.html The example is that you have two connections to the internet -- one fast, one slow, and they route mail (port 25) to the slow one.

  • Interesting. I found a very similar guide here, and I set it up, but traffic for that port is still going over the VPN. I wonder if something else is taking precedence? I'm not sure how to troubleshoot. – Randy May 12 '15 at 23:59
  • Honestly, me neither. You could check to see if iptables rules are getting hit with iptables -n -v -x -c -- shows you packet counts on each rule. As far as iptables rules, not really sure. – Otheus May 13 '15 at 0:04

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