Re: Comcast residential DNS contact

[Grant Ridder <shortdudey123 () gmail com>]

Ah that makes sense.  I am not going to worry about the inconstancy then.

Thanks to everyone that replied!!

-Grant

On Wed, Dec 3, 2014 at 10:30 AM, Doug Barton <dougb () dougbarton us> wrote:

> On 12/3/14 10:07 AM, Grant Ridder wrote:
>
> > Did more digging and found the RFC regarding ANY queries:
> >
> > 3.2.3 - * 255 A request for all records
> > https://www.ietf.org/rfc/rfc1035.txt
>
> When listing URLs for RFCs it's better to use the tools site, as it gives
> a much better experience:
>
> https://tools.ietf.org/html/rfc1035
>
> Meanwhile, the text is correct, but what you're missing is the nuance of
> authoritative vs. recursive. If you send an ANY query to an authoritative
> server it is naturally going to send you all of the related records, since
> it has them all.
>
> A recursive (or iterative if you prefer) server only has what it has in
> the cache, but it will send you "all records" that it has. What this does
> not imply is that the recursive server will go out and do its own ANY query
> for the RR you're asking about, unless there is nothing in the cache to
> start with.
>
> There are any number of explanations for why some of the recursive servers
> you're querying have more records than others. None of them are bugs. :)
>
>  However Wikipedia (http://en.wikipedia.org/wiki/List_of_DNS_record_types)
> > lists this as a request for "All cached records" instead of "A request for
> > all records" per the RFC.
>
> Wikipedia is good for a lot of things, but standards work is not one of
> them. :)  The text above is a good example of why.
>
> Doug