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Date:      Fri, 15 Dec 2000 02:33:20 -0500 (EST)
From:      Mike Nowlin <mike@argos.org>
To:        Lists Account <lists@security.za.net>
Cc:        hackers@FreeBSD.ORG
Subject:   Re: NOS-TUN / Natd
Message-ID:  <Pine.LNX.4.21.0012150229530.8135-100000@jason.argos.org>
In-Reply-To: <Pine.BSF.4.21.0012150747130.94071-100000@security.za.net>

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> Just a quick question out of interests sake, I was setting up nos-tunnels
> yesterday, and I had the tunnel functioning 100% perfectly, however I
> could not get it to NAT the remote side of the tunnel, until I put an ipfw
> divert 8668 ip from any to any via any statement in my firewall config.

> ipfw add 1 divert 8668 ip from any to any in recv tun0 

My first thought is to do something like:

ipfw add 1 allow ip from any to any in via tun0
ipfw add 2 divert 8668 ip from 1.2.3.4 to any


...where 1.2.3.4 is an IP on the remote end of the tunnel - send a few
packets from 1.2.3.4, then do an "ipfw s" to see if they're hitting that
rule.  

That should help figure out if it's a problem with the tunnel code, or a
problem with your ipfw rules.  (ipfw can bring up some interesting
situations, especially with NAT.)

mike





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