How to play on 2 PC's on the same server from one house( one external IP) ?

Does adjusting your uPnP settings on your router help?

http://en.wikipedia.org/wiki/Universal_Plug_and_Play

Also, if you use the steam version, perhaps the clientport steps in this post will work: http://battlelog.battlefield.com/bf4/forum/threadview/2955064769714074638/

Thanks for quick response.

I tried both on and off uPnP with no effect.

I am not using steam version.

Both are dvd versions, but one of them installed thru origin.

I've already tried  the  +clientport thing, but it does not work for me

Hi,

have you made set port forwardings on your router in the past? If so traffic is probably only forwarded to one computer.

If there are rules try to deactivate them.

hi,

I have never set up port forwarding for the bad company2.

The nature of the problem is as you described - traffic from the server is being forwarded to only on e computer - both games use the same ports:  18390 and 18395 ( according to netstat) .  If they operated on different ports there would not be a problem I suppose. The game seems to ignore the +clientport parameters, as netstat  always show the values above.

http://help.ea.com/en/article/online-ports-for-battlefield-bad-company-2/ says that  the game uses  TCP: 80, 18390, 18395, 13505  and UDP: 18395, 10000 so I think the port range from the +clientport  trick could hardly work.

Which numbers did you put in the +clientport?

try any number between 27005 and 27032 but do not use 27020

Ive tried a lot of them always following the rule you mentioned, but no success. My feeling is that this +clientport fhing is simply ignored by the game , as it seems the game uses the same tcp ports whatever the parameter is.

Hey, good to hear that. Thanks for posting your solution.