[dns-operations] Using all the addresses of every name server? (Was: ANY efforts at taking additional responses more compact?

[Florian Weimer]

On 09/12/2016 09:53 AM, Stephane Bortzmeyer wrote:
> On Mon, Sep 12, 2016 at 09:47:50AM +0200,
>  Florian Weimer <fweimer at redhat.com> wrote
>  a message of 21 lines which said:
>
>> If there is a query which leads to an unexpected response from the
>> upstream servers,
>
> Why? The RFC only mentions the lack of response, as a reason to try
> other addresses, not "unexpected responses".

Is an ICMP response a lack of a response?  Is a REFUSED response?  What 
about NOTIMP?

And waiting for hundreds of three-second timeouts will nicely tie up the 
recursive resolution context anyway.

Florian