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Re: TCP checksum recalculation

To: IP Security List <ipsec@lists.tislabs.com>
Subject: Re: TCP checksum recalculation
From: Dave Perks <Dave_Perks@mitel.com>
Date: Tue, 20 Jul 1999 15:08:24 -0400
Organization: Mitel Corporation
References: <4.1.19990720115931.00b6f8e0@homebase.htt-consult.com>
Sender: owner-ipsec@lists.tislabs.com

Robert Moskowitz wrote:
> 
> As I looked over Kai's MIKE proposal, I got to thinking about transport
> mode.  The more I thought about transport mode, the more I looked for what
> we do for maintaining the TCP checksum.
> 
> It seems to me that transport mode breaks the checksum and requires its
> recomputation on deencapsulating.  I could not find any discussion of this
> in the RFCs.

TCP checksum does not include TTL from IP header, only the IP addresses.
--
      The opinions expressed in this message are my personal
      opinion and in no way reflect the views of my employer.
 Søren Kierkegaard says
 "Life can only be understood backwards; but it must be lived forwards."

References:

TCP checksum recalculation

From: Robert Moskowitz <rgm-sec@htt-consult.com>

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