[dns-operations] extra records in resolver answer, any benefit?

[bert hubert]

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.

	Bert