On 23 sep 2013, at 08:16, Jakob Schlyter <[email protected]> wrote:

>> Validating resolvers will drop an RRSIG from a cache and re-fetch if the 
>> local clock has ticked past the expiration timer specified in the 
>> corresponding RRSIG RDATA field.
> 
> I would not "might drop", not "will drop". The specification is not strict on 
> this and even though refetching may be the sane thing to do, I can imagine 
> validating resolvers just returning bogus if the (expired) signature in the 
> cache does not validate the associated cached data.

Unbound will cap the TTL of the resulting records to the remaining 
TTL-to-expiry for that RRSIG. And then normal TTL countdown stops expired 
RRSIGs from user results.

        jakob

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