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IPCOMP using DEFLATE

To: IPSec <ipsec@lists.tislabs.com>
Subject: IPCOMP using DEFLATE
From: Mike Williams <mikewill@ibm.net>
Date: Thu, 09 Sep 1999 09:50:15 -0400
CC: geblerp@us.ibm.com
Sender: owner-ipsec@lists.tislabs.com

We have been looking at using zlib as a source for the DEFLATE
compression algorithm for IPCOMP.  One of the things that we have
noticed is that a "dictionary" can be used.  Since there is no way to
negotiate a compression dictionary with IKE, I am assuming that a
dictionary is not used with DEFLATE within the scope of IPCOMP. Is this
true?  Are there any implementations that do use a dictionary with
DEFLATE?

I have also noticed that RFC2407 does define a "Compress Dictionary
Size" attribute.  How is this used?  It seems like IKE would have to not
only negotiate the dictionary size, but also the dictionary value for
this to be useful.

Mike Williams

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