From owner-freebsd-questions  Fri Jul  6  1:38:43 2001
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From: "Artem Koutchine" <matrix@ipform.ru>
To: "Enriko Groen" <enriko.groen@netivity.nl>,
	<questions@FreeBSD.ORG>
References: <510EAC2065C0D311929200A0247252622F7959@NETIVITY-FS>
Subject: Re: UDP client behind a nat. How?
Date: Fri, 6 Jul 2001 12:32:27 +0400
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Let me clear it up.

There is a client with address: 192.168.0.2
There is a gateway with nat: local interface: 192.168.0.1
internet interface: a.b.c.d
ICQ SERVER: W.X.Y.Z
Now, how does ICQ server send data to the icq
client which is on 192.168.0.2 via NAT?


----- Original Message -----
From: "Enriko Groen" <enriko.groen@netivity.nl>
To: "'Artem Koutchine'" <matrix@ipform.ru>; <questions@FreeBSD.ORG>
Sent: Friday, July 06, 2001 11:52 AM
Subject: RE: UDP client behind a nat. How?


> > -----Original Message-----
> > From: Artem Koutchine [mailto:matrix@ipform.ru]
>
> > 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.
>
> You confuse two things:
>
> Yes, ICQ uses UDP and UDP is connectionless... however it does use a
> socket/port.
> So you'll need to open the ICQ port on your firewall. I think it is
4000,
> but I'm not that sure.
>
> --
> Enriko Groen, Hosting manager
> --------------------------------------------------------
> netivity bv   www.netivity.nl   enriko.groen@netivity.nl
> 038 - 850 1000   van nagellstraat 4      8011 eb  zwolle
> --------------------------------------------------------
>
>
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