[dns-operations] TTL=0; Last known good answer (Re: dns retries amplify attack)

Tony Finch dot at dotat.at
Mon Oct 24 15:54:42 UTC 2016

Jared Mauch <jared at puck.nether.net> wrote:
> 	I saw some people return the last known good response w/ TTL=0,
> when the authorities are unresponsive.  How widely is this used/configured?

OpenDNS does that; I don't know of any others.

f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/  -  I xn--zr8h punycode
Trafalgar: South 4 or 5, increasing 6 at times, becoming cyclonic 6 to gale 8
later. Very rough or high. Rain or showers. Moderate or good, occasionally

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