EDNS and fallback

Anand Buddhdev anandb at ripe.net
Thu May 14 20:19:07 UTC 2015

On 14/05/15 22:02, Bischof, Ralph F. (MSFC-IS40)[NICS] wrote:

Hi Ralf,

> symptoms I am seeing is that a dig command sends out several queries
> with EDNS and bufsize of 4096. The server on the other side of this

I think this is the pertinent point. You're testing with dig, but dig
doesn't fallback to smaller buffer sizes. That only happens within the
named process. You should run named with debugging turned on, and then
send it queries to resolve, and observe buffer size fallback.


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