Are failures cached?

[Chris Buxton]

This is not a case of negative caching, though. In this case, the OP  
was asking about caching of the fact that no authoritative servers  
could be reached - the servers were lame at best. How is that fact  
cached?

Chris Buxton
Professional Services
Men & Mice

On Apr 28, 2008, at 2:03 PM, Jeremy C. Reed wrote:

> You may find some of your answers in RFC 2308 and in the ARM.
>
> http://www.faqs.org/rfcs/rfc2308.html
> http://www.isc.org/sw/bind/arm94/Bv9ARM.ch06.html#Setting_TTLs
>
> "The last field in the SOA is the negative caching TTL. This  
> controls how
> long other servers will cache no-such-domain (NXDOMAIN) responses from
> you. The maximum time for negative caching is 3 hours (3h)."
>
> (As for taking a couple days to resolve your problem, I don't know.)
>
>