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Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt-01

"Caitlin Bestler" <Caitlin.Bestler@neterion.com> Tue, 29 July 2008 19:10 UTC

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From: Caitlin Bestler <Caitlin.Bestler@neterion.com>
To: Joe Touch <touch@ISI.EDU>, Eric Rescorla <ekr@networkresonance.com>
Cc: Adam Langley <agl@imperialviolet.org>, tcpm@ietf.org, "Anantha Ramaiah (ananth)" <ananth@cisco.com>
Subject: Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt-01
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A few comments on the alignment issue:

1) Compared to the cost of supporting the crypto-engines and their
supporting
   data, dealing with variable alignment is unlikely to be a major
factor in
   determining whether to include hardware support for TCP-Auth or not.
2) The optimizing alignment might be 64-bits anyway. This only
emphasizes the
   point that putting padding in TCP headers based on presumptions of
what is
   efficient is short-sighted.
3) Hardware support for TCP-Auth is in competition with MACsec, IPSEC
and TLS.
   So any thoughts of optimizing for implementation should probably
focus on
   software implementations and/or specialized devices. I would be
surprised
   to see hardware assists for this in general purpose NICs.

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