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 From:  Fred Wright <fw at well dot com>
 To:  m0n0wall dash dev at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall-dev] Problem with UDP connections to game servers
 Date:  Tue, 12 Apr 2005 01:09:21 -0700 (PDT)
On Mon, 4 Apr 2005, Joachim Sehlstedt wrote:

> We have a problem that only two game clients, tried with both
> Counter-Strike and Call of Duty, can connect to the same server out on
> the Internet. When the third tries to connect nothing happens, before we
> installed the m0n0wall here we had a masquerading Linux box and there
> was no problems with it.
> 
> This only seems to affect UDP because I tried to have 5+ SSH clients
> open to the same host and they all worked.
> 
> We are running version: 1.2b6
> 
> We do not have any firewall rule that adresses UDP only TCP so I don't 
> think that this is a configuration error made by me.
> 
> Can this be solved or is this a known limitation?

"Ordinary" outgoing UDP works fine through NAT.  But if the originating
ports are in a range that the NAT doesn't think should get remapped, then
there could be a collision.  What ports does the game use?  It sounds
suspiciously like it might have a choice of two.

					Fred Wright