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Re: [tcpm] tcp-auth-opt issue: support for NATs

Eric Rescorla <ekr@networkresonance.com> Thu, 07 August 2008 18:20 UTC

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Date: Thu, 07 Aug 2008 11:21:34 -0700
From: Eric Rescorla <ekr@networkresonance.com>
To: Adam Langley <agl@imperialviolet.org>
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Cc: tcpm@ietf.org, Joe Touch <touch@isi.edu>
Subject: Re: [tcpm] tcp-auth-opt issue: support for NATs
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At Thu, 7 Aug 2008 11:10:38 -0700,
Adam Langley wrote:
> 
> On Thu, Aug 7, 2008 at 11:05 AM, Eric Rescorla <ekr@networkresonance.com> wrote:
> > Because the side doing the passive open doesn't know which client
> > is connecting and it may have multiple instances of the same key-id?
> > I don't understand the purpose of the time. Just do trial verifications
> > with each key.
> 
> I don't believe that there should be multiple instances of the same
> keyid. This is for the situation where there is a shared key between
> the server and all valid clients. If we wished, we could fine that to
> be keyid 0, sign the packets and be done with it.
> 
> But since the SEQ/ACK space isn't that large, and a replayed SYN could
> still be used to SYN flood a system, I sketched that system to rotate
> the keys based on time to limit the scope of replays.

Huh? You're worried about being SYN flooded by people with whom
you share a trust relationship with? That doesn't seem particularly
likely.

-Ekr
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