Re: Simple packet filter
From: Barry Margolin (barry.margolin_at_level3.com)
Date: 06/11/03
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Date: Wed, 11 Jun 2003 15:11:28 GMT
In article <c797e024.0306110017.720db515@posting.google.com>,
Jaap de Koning <j.dekoning@spectrafacility.nl> wrote:
>Hello,
>
>I am looking for a simple packet filter, which should only do the
>following:
>
>I have an Windows 2000 server with 2 network cards. All HTTP and other
>internet trafic is handled by our firewall, so no worries there. The
>mail is received on the other network card, and i would like to just
>enable that card for SMTP (port 25). In other words, i would like to
>shut down the entire networkcard except for port 25.
SMTP servers often send out DNS queries, so you'll need to allow the
replies back in as well. These don't have a fixed local port, but the
remote port will always be 53.
>Does anyone know if such software exists? I would like it to be cheap,
>preferably even free.
Doesn't Windows have a built-in packet filter?
-- Barry Margolin, barry.margolin@level3.com Level(3), Woburn, MA *** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups. Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.
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