[dns-operations] extra records in resolver answer, any benefit?
bert.hubert at netherlabs.nl
Tue Jan 27 10:46:13 UTC 2015
On Tue, Jan 27, 2015 at 09:40:42PM +1100, Mark Andrews wrote:
> > It is all optional, and nobody does anything with that data. In fact stub
> > resolvers do very little with what they receive. So for example, even the
> > additional processing for an MX record is completely ignored mostly.
> That is really dependent on the application.
Can you name me one client side application that benefits from anything
other than the answer section?
> > It also saves CPU for the resolver.
> Named will save, validate and return additional data without
> performing additional queries if it is signed (assuming the DNSKEY
> records exist in the cache and have already been validated).
It will still be digging through caches and creating larger packets though.
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