OpenVPN on Ubuntu Server and problem with port forwarding.

[czacha994 1]

Hello.

I have a problem with configuring my server (Ubuntu 16.04.2 LTS) properly for P2P. I wanted to send ONLY torrent traffic through VPN, leaving normal traffic untouched so I can connect through SSH.

So:

I used this guide https://www.htpcguides.com/force-torrent-traffic-vpn-split-tunnel-debian-8-ubuntu-16-04/ for forcing my connection to use VPN. I modified it a little bit only to make it work with airvpn. And it is indeed working. ipleak.net is showing correct vpn ip. But the I'm having difficulties with opening my port. I didn't forward it anywhere in my iptables because I found on forum that you just don't do that. Just unlocked it on airvpn.

 

I even tested forwarding on my home network (without forwarding ports in my router) and on airvpn tester and http://www.yougetsignal.com it indeed is opened. So why can't I make it work on my server ? On airvpn tester the port is not responding and yougetsignal is telling me that it's closed. Torrents are seeding, but the speed is sometimes not that good and I think that forwarding may be the reason for it.

 

Of course I properly set the port in torrent (same I forwarded on site). 

 

in   netstat -lntu  I can find that the port is listening, but only in TCP.

 

tcp        0      0 0.0.0.0:55XXX           0.0.0.0:*               LISTEN

 

What can I do to make it work ?

[zhang888 1066]

The idea is that you are not supposed to do it on a router if your router is not the device you run OpenVPN on, to prevent correlation attacks.

If this is a server, you must use iptables or set up the device you are running OpenVPN on to forward those ports.

[czacha994 1]

Wow... You are right, i just had to change iptables.sh a little bit and everything went smooth (https://www.htpcguides.com/configure-auto-port-forward-pia-vpn-for-deluge/ used bit from that). Thanks a lot zhang888! Port is unlocked properly now and is seen as unlocked in airvpn and portchecker.