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Date:      Thu, 22 Oct 1998 15:57:48 -0400
From:      Damon Hopkins <dhopkins@rtci.com>
To:        Chad Thunberg <chadth@atvideo.com>
Cc:        freebsd-security@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG
Subject:   Re: firewall + internal mail server
Message-ID:  <362F8E3C.E3C820B7@rtci.com>
References:  <000501bdfdde$1f5f53b0$ef2376cc@tarn.atvideo.com>

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I do it this way.. I don't think that the udp stuff is necessary but I
put it in there because Im to lazy to find out

my natd.conf file
#smtp
redirect_port tcp 10.0.0.2:25 216.27.37.251:25
redirect_port udp 10.0.0.2:25 216.27.37.251:25

#pop3
redirect_port tcp 10.0.0.2:110 216.27.37.251:110
redirect_port udp 10.0.0.2:110 216.27.37.251:110

#imap
redirect_port tcp 10.0.0.2:143 216.27.37.251:143
redirect_port udp 10.0.0.2:143 216.27.37.251:143

Chad Thunberg wrote:
> 
> I am setting up a firewall and enabled natd but have an internal mail
> server.  Is there a way to still be able to access the internal mail server
> from the outside for sending and receiving email?  I thought about giving
> the firewall a vhost of mail.host.com and diverting packets that came in
> from 110 and 25 to the internal mail server but from the man pages, divert
> seems to be used for diverting packets from one port to another on the same
> machine instead of diverting them to a new or ineternal ip.  Any help on the
> subject would be great.  I would rather not put the mail server outside of
> the firewall.
> 
> Thanks,
> -Chad
> 
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