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

[Tony Finch]

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.

Tony.
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