On 4. 9. 2013, at 16:11, Jim Reid <j...@rfc1035.com> wrote: > > On 4 Sep 2013, at 15:04, Ondřej Surý <ondrej.s...@nic.cz> wrote: > >>> A possible solution is simply to deploy IPv6 faster :-) > >> Yeah :), but what should we do in the eternity meanwhile? > > Don't fragment at all, set TC=1 on responses which would cause UDP or lower > layer fragmantation and assume only genuine queries will do a TCP retry, > avoiding rate limiters?
But that will still strip-out the paths where the fragmentation is needed, and the MTU is lower than your limit in DNS server. Remember that the DNS server has no idea what the MTU is and whether the fragmentation is needed or not. O. -- Ondřej Surý -- Chief Science Officer ------------------------------------------- CZ.NIC, z.s.p.o. -- Laboratoře CZ.NIC Americka 23, 120 00 Praha 2, Czech Republic mailto:ondrej.s...@nic.cz http://nic.cz/ tel:+420.222745110 fax:+420.222745112 -------------------------------------------
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