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From: "Andrey Simonenko" <simon@comsys.ntu-kpi.kiev.ua>
To: "Artem Koutchine" <matrix@ipform.ru>
Cc: <freebsd-questions@freebsd.org>
References: <004d01c105ec$cf2ae480$0c00a8c0@ipform.ru>
Subject: Re: UDP client behind a nat. How?
Date: Fri, 6 Jul 2001 12:17:13 +0400
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----- Original Message ----- 
From: Artem Koutchine <matrix@ipform.ru>
Newsgroups: lucky.freebsd.questions
Sent: Friday, July 06, 2001 11:25 AM
Subject: UDP client behind a nat. How?


> Hi!
> 
> I don't undertstand how ICQ works behind
> natl? How does server send data to 
> the client, which is behind a NAT firewall?
> As far as i know iCQ uses UDP and does not
> keep connection open, so, no soket associated
> with the ICQ on NAT or ICQ SERVER. ICQ client
> cannot be accessed directly. Then HOW does
> a message appear in ICQ when server gets it?
> I need to know it because i need to do the same
> thing.
> 

Run natd in foreground regime, run tcpdump and
check if ICQ works as you described. Also ipfw log
can help to understand it. Also netstat command run
on client machine tells you if there are any TCP
connections with ICQ server.



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