Timeout semantics of Unbound differ radically from Bind 9

Phil Mayers p.mayers at imperial.ac.uk
Mon Apr 11 10:08:04 UTC 2016

On 10/04/16 21:28, Dhalgren Tor via Unbound-users wrote:

> If you see anything mistaken in any of the above please let me know.

I can't comment on the unbound/Tor specifics, but note that it's totally 
possible to get bind into a state where it won't respond at all in the 
cited time windows, if upstream connectivity is broken. I've seen this 
on a number of occasions.

Am I correct in understanding that the Tor/eventdns code is, 
effectively, self-DoS'ing by marking all of its nameservers dead for 
increasingly long backoff times?


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