[dns-operations] PMTUD of .org servers

Florian Weimer fw at deneb.enyo.de
Sat Jun 20 09:46:30 UTC 2009

* Paul Vixie:

>> What Solaris needs is hooks to allow this to be done on a per socket
>> basis or to only apply it to TCP traffic.
> seems more likely that they'll leave DF on by default.  EDNS speakers
> should probably open the ICMP socket and look for evidence of DF damage.

On the client side, a raw IP socket (perhaps bound to the UDP protocol
if the stack allows it) and looking for tail fragments (which are
likely to get through because they don't exhaust the path MTU) could
provide some data.  It might be easier to run fragment assembly
entirely in user space instead of matching this data to the UDP
sockets you receive. 8-/

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