[AusNOG] WA-based Public DNS Servers

[Martin Visser]

Just a point of clarification and pedantry in regard to saying "Multicast
addresses like 1.1.1.1 and 9.9.9.9 won't help with that"

Those services and their respective IP addresses are properly known as
"anycast" addresses - not multicast. The difference being is that the
prefixes associated with those addresses are injected into the BGP
propagated internet routing table at multiple points. A packet forwarded to
1.1.1.1 from any one point on the Internet should only reach a single
actual endpoint (if the routing table is stable at that point of time) and
hence expect only a single response.  If it were a properly configured and
advertised multicast address ( it would be some in the 224.0.0.0/4 rather
than 1.1.1.1) then your DNS request would be sent to all such registered
receivers (which in the case of DNS probably isn't want you want)

Regards, Martin

MartinVisser99 at gmail.com


On Thu, 2 Sept 2021 at 18:18, Sean Burford <sburford at google.com> wrote:

> Hi,
>
> It sounds like you're looking for routers to send a few queries through,
> in order to compare the results with the same queries sent via your normal
> path with EDNS0 ECS?  Multicast addresses like 1.1.1.1 and 9.9.9.9 won't
> help with that.
>
> What you might actually want is to search for a WA based DNS looking glass?
>
> For DNS servers, have a browse under
> https://www.whatsmydns.net/dns/australia .  You won't be able to recurse
> through many of them, but some of them will work.  Just don't play yourself
> by assuming the locations are correct:
> * Check the resolver that the router uses by looking at "ns" in the output
> from (eg.) dig +short @192.189.54.17 TXT whoami.ds.akahelp.net
> * Check the geolocation of the resolver.  This is a favourite topic for
> *NOG lists.
>
> Alternatively, an operator on this list might volunteer their WA based DNS
> router for your experiment?
>
> On Thu, Sep 2, 2021 at 5:38 PM David Fowler <david.fowler at 7bit.com.au>
> wrote:
>
>> Hi folks
>>
>> Is anyone aware of any WA-based Public DNS Servers?
>>
>> Trying to guarantee the DNS records returned are local for specific
>> project reasons.
>>
>> Kind Regards
>>
>> Dave Fowler
>> _______________________________________________
>> AusNOG mailing list
>> AusNOG at lists.ausnog.net
>> http://lists.ausnog.net/mailman/listinfo/ausnog
>>
>
> _______________________________________________
> AusNOG mailing list
> AusNOG at lists.ausnog.net
> http://lists.ausnog.net/mailman/listinfo/ausnog
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ausnog.net/pipermail/ausnog/attachments/20210907/d729bf88/attachment.html>