EDNS maximum outbound payload size - configurable?

Vasiliy Baranov Vasiliy.Baranov at Sun.COM
Fri Aug 1 15:22:57 UTC 2008


Gentlemen,

In BIND, is there an "additional local" limit on the payload size of 
EDNS responses the server can send? Is it configurable? edns-udp-size 
sets the advertised buffer size for responses going TO the server. Is it 
also used as the limit on responses going FROM the server (in addition 
to the limit advertised by the client)?

In other words, if my authoritative nameserver is behind a device that 
drops outgoing fragmented packets, can I configure BIND to not send EDNS 
responses that would require fragmentation?

BIND 9.3.5-P1, if that matters.

Thank you,
Vasiliy


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