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Date:      Tue, 8 Aug 2000 10:08:03 -0400 (EDT)
From:      Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
To:        Benjamin Gavin <virtual_olympus@yahoo.com>
Cc:        freebsd-net@FreeBSD.ORG
Subject:   NATD and non-UDP/TCP packets
Message-ID:  <200008081408.KAA13542@khavrinen.lcs.mit.edu>
In-Reply-To: <20000808004424.2838.qmail@web312.mail.yahoo.com>
References:  <20000808004424.2838.qmail@web312.mail.yahoo.com>

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<<On Mon, 7 Aug 2000 17:44:24 -0700 (PDT), Benjamin Gavin <virtual_olympus@yahoo.com> said:

>   What are the fundamental differences between ESP/AH and TCP/UDP?  Are
> they inherently more complicated to translate,

They are designed to be cryptographically secure, and hence,
impossible to NAT.  If you want to do NAT, you'll have to terminate
the SAs at the boundary and create an appropriate new set for the
``public'' side.

-GAWollman

--
Garrett A. Wollman   | O Siem / We are all family / O Siem / We're all the same
wollman@lcs.mit.edu  | O Siem / The fires of freedom 
Opinions not those of| Dance in the burning flame
MIT, LCS, CRS, or NSA|                     - Susan Aglukark and Chad Irschick


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