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Date: Thu, 4 Dec 2003 21:28:09 -0800
From: "Crist J. Clark" <cristjc@comcast.net>
To: Dr Otacon <otacon@octo.sytes.net>
Message-ID: <20031205052809.GA91506@blossom.cjclark.org>
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cc: freebsd-ipfw@FreeBSD.ORG
cc: freebsd-stable@FreeBSD.ORG
Subject: Re: tcpdump will not compile with ability to decrypt ESP
	encapsulated packets.
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On Tue, Dec 02, 2003 at 10:28:52AM -0700, Dr Otacon wrote:
> I'm trying to tcpdump ESP encapsulated packets with tcpdump using:
> 
>     tcpdump -w tcpdump.log -E blowfish-cbc:secret esp host safehost

Tcpdump(8) does not decrypt as it saves data in the pcap dump file. It
only decrypts on the fly as it prints packet contents.

> ...but `tcpshow < tcpdump.log' has this message repeated at the end of every 
> packet:
> 
>     <*** No decode support for encapsulated protocol ***>

Tcpshow(1) would have to decrypt the ESP data itself for this to
work.
-- 
Crist J. Clark                     |     cjclark@alum.mit.edu
                                   |     cjclark@jhu.edu
http://people.freebsd.org/~cjc/    |     cjc@freebsd.org