> Mukund Sivaraman <mailto:m...@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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