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Re: [DNSOP] Review of draft-ietf-dnsop-cookies-00

Paul Vixie <paul@redbarn.org> Tue, 16 December 2014 17:20 UTC

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Date: Tue, 16 Dec 2014 09:20:12 -0800
From: Paul Vixie <paul@redbarn.org>
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To: Mukund Sivaraman <muks@isc.org>
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Subject: Re: [DNSOP] Review of draft-ietf-dnsop-cookies-00
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> Mukund Sivaraman <mailto:muks@isc.org>
> Tuesday, December 16, 2014 9:13 AM
>
> Sorry, TCP also takes 2 RTT similar to UDP with DNS cookies. I had
> included the initial UDP query by mistake, but this won't be involved if
> TCP is directly tried.

3 round trips, 7 packets, for an isolated tcp/53 query.

s   ->
    <- s+a
a   ->
q   ->
    <- r+a
f+a ->
    <- f+a

obviously, the dickenson tcp change proposal bears on this, but today,
it's 3 rtt, 7 pkt, and that's assuming that the response fits in one
window. axfr is obviously much longer.

-- 
Paul Vixie

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