FORMERR - automatically retried?

[John Horne]

Hello,

We are running Unbound 1.16 on a Rocky 9 Linux server, and I'm trying to see
why some DNS lookups are intermittently failing. It seems to be that the
FORMERR code is being returned, probably due to EDNS being specified.

My question is does Unbound disable EDNS and retry requests which return a
FORMERR error? I gather that this is done by some DNS software, but am unsure
if Unbound does this.

Looking at the Unbound logs shows (for example):

Aug 11 22:31:35 unbound[944:0] query: 10.121.16.73 collector.newrelic.com. A IN
Aug 11 22:31:35 unbound[944:0] reply: 10.121.16.73 - - - FORMERR - - -

There is no logged retry for the request, so I am assuming that Unbound does
not retry requests after a FORMERR error.



Thanks,

John.

--
John Horne | Senior Operations Analyst | Technology and Information Services
University of Plymouth | Drake Circus | Plymouth | Devon | PL4 8AA | UK
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