please help me understand!

[Kevin Darcy]

"Atkinson, Daniel" wrote:

> Hi guys,
>
> Just a quick question to help my understanding of DNS.
>
> If I add a new A record to a zone for which my server is authoritative, will
> this record be immediately available everywhere on the internet because it
> hasn't been previously cached? OR, do the caching servers know that it
> doesn't exist and answer accordingly...

If another nameserver has queried the name recently, then it should have a
"negative" cache entry. The TTL for negative cache entries is determined by the
last field of the SOA record, one of which is returned in the Authority Section
of NXDOMAIN responses. See RFC 2308 for more details.


- Kevin