EDNS packet sizes
howard at cohtech.com
Tue Jun 17 09:45:45 UTC 2008
I am coding up some software that will attempt to use EDNS queries
against the name servers it is interrogating. I was wondering if the
strategy of setting the maximum packet size to 65k would promote any
failures in the target name servers or the pathways to them that a
smaller packet size may not?
I know some servers will fail to respond to EDNS and am coping with that
already, but I am trying to work out whether I need to do packet size
discovery in my code or can I leave this to the name servers MTU
discovery process in all cases.
I understand that firewalls in the pathway may also cause problems, but
again will the servers cope or do I need to try something like a binary
chop discovery mechanism.
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