Trying again on SERVFAIL

Havard Eidnes he at
Thu Feb 11 09:44:58 UTC 2021

> Still, being able to differentiate a local network congestion from a
> remote bad configuration would help.

That's true.  There's

which look promising, trying to make it possible to distinguish
between the various reasons a recursor might choose to return a
SERVFAIL response.  It uses an EDNS option to communicate the
additional information.

As for its implementation status in general or in BIND in
particular I'll admit that I don't know off-hand.


- Håvard

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