[dns-operations] best way to reprime root-hints?
Mark_Andrews at isc.org
Tue Feb 5 05:02:01 UTC 2008
> > This assumes the name servers running on all instances are the same.
> > Are they?
> i think so, yes.
> > (Note that I assume that all instances on all servers support EDNS0).
> i think they do.
> > P.S. I think setting the limit arbitrarily to 1200 is likely a
> > mistake. Someday, not only will we have 13 AAAAs and 13 As, but we
> > may also have DNSSEC cruft. Not sure all of that will fit in 1200...
> it was on the hopeful assumption that by that time the maximum minimum
> MTU will be more than 1500, that the recommended default buffer size
> for EDNS0 is 4096. rare fragmentation/reassembly is better than common
> place TCP.
Just a reminder for everyone 512 was choosen because it was
the minimum network re-assembly buffer size. It was *not*
choosen to avoid fragmentation.
EDNS is designed to advertise a bigger re-assembly buffer size
than the network minimum.
EDNS sizes are not normally choosen to avoid fragmentation,
fragmentation is to be expected.
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews at isc.org
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