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

"Anantha Ramaiah (ananth)" <ananth@cisco.com> Tue, 29 July 2008 14:48 UTC

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From: "Anantha Ramaiah (ananth)" <ananth@cisco.com>
To: Joe Touch <touch@ISI.EDU>
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Cc: Adam Langley <agl@imperialviolet.org>, tcpm@ietf.org
Subject: Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt-01
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Joe,

<snip>
 
> |> If you want to have partial coverage, this should be 
> handled at the 
> |> TCP-AO level.
> |
> | I agree and that was what I was thinking when I was proposing this.
> |
> |> I appreciate that you're trying to isolate the crypto from 
> the TCP-AO 
> |> service, but I don't think you can isolate it to this extent.
> |
> | Agreed. It needs to come from TCP-AO level even it means 
> changing the 
> | format of the TCP-AO option to accomadate this. As an end 
> user of this 
> | option I wan't to know how much was "digested" explicitly 
> conveyed as 
> | opposed to implicit schemes. Having this in TCP-AO allows a  per 
> | packet granularity and that is good to have, IMO, if we are 
> going down 
> | this route.
> 
> Can you explain how this might correlate to a segment? or why 
> per-segment info is needed?

Flexibility, applications would want to ( I am not making this up)
"protect" crucial information, atleast what it considers as crucial
information. For performance reasons being one of them. Agreed, TCP
shouldn't care.

> 
> More to the point, given there is no corresponding UDP-lite 
> for TCP, why is this needed for TCP-AO?

After you clarified to me in the hallway conversation, I agree with your
viewpoint.

Anyways, it appears that we are not yet converged on what can be
included in the TCP-AO and the degree of flexibilty one can expect. At
the least it would be expedient to reflect the discussions in the
document since I am sure these things would come up at some point again.

-Anantha

 <snip>
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