[dns-operations] PMTUD of .org servers
vixie at isc.org
Fri Jun 19 03:02:42 UTC 2009
> From: Mark Andrews <marka at isc.org>
> Date: Fri, 19 Jun 2009 11:08:27 +1000
> Linux and Solaris set DF by default. Linux boxes allow it
> to be modified on a per-socket basis. On Solaris boxes it
> is a global flag. You can't disable DF on UDP without also
> disabling DF on TCP.
> Other boxes that implement path mtu discovery appear to only
> do it on TCP connections by default.
> Named turns off the setting of DF for UDP on all platforms
> where we are aware of a per socket control.
> Setting DF on UDP/DNS responses is detrimental to DNS.
so solaris basically can't be a good edns server, period, full stop?
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