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

Eric Rescorla <ekr@networkresonance.com> Mon, 11 August 2008 18:32 UTC

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Date: Mon, 11 Aug 2008 11:42:14 -0700
From: Eric Rescorla <ekr@networkresonance.com>
To: Ron Bonica <rbonica@juniper.net>
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Cc: Adam Langley <agl@imperialviolet.org>, tcpm@ietf.org, Joe Touch <touch@ISI.EDU>
Subject: Re: [tcpm] tcp-auth-opt issue: support for NATs
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At Mon, 11 Aug 2008 14:19:01 -0400,
Ron Bonica wrote:
> 
> 
> > That's a reason we have a keyID, which, together with the socket pair,
> > should exactly specify what key to use and avoids this sort of trial.
> 
> Amen!
> 
>   If
> > we can live with trials, we can remove the keyID and things align much
> > better.
> > 
> 
> But we can't!

If we can't ever have trial authentication than there must be a unique
key for each (key-id, remote addr) pair. As a practical matter,
this implies either that:

- Key-ids must be globally unique.
- You need to know the other side's IP address, even if you're doing
  a passive open.

-Ekr
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