[no subject]

[Robert Glenn <glenn@xxxxxxxxxxxxxxxxxx>]

IAA04917; Fri, 6 Dec 1996 08:23:37 -0500 (EST)
Date: Fri, 6 Dec 1996 08:23:37 -0500 (EST)
Message-Id: <199612061323.IAA04917@sloth.ncsl.nist.gov>
To: ipsec@tis.com
Subject: Re: Replay counter sizes: AH vs ESP -Reply
Sender: owner-ipsec@portal.ex.tis.com
Precedence: bulk

Keep in mind that these transforms are specified to provide security services
for both version 4 and 6 of IP.  IPv6 insists that "each extension header
be an integer multiple of 8 octets, in order to retain 8-octet alignment for
subsequent headers." (RFC1883)  The differences in the Replay Prevention fields
is primarily due to this alignment.  A change to either would require
adding an additional 32 bits of wasteful pad.

Rob G.
-- 
rob.glenn@nist.gov