[160419] in North American Network Operators' Group
Re: AT&T Uverse/DSL Network Engineer DNS question
daemon@ATHENA.MIT.EDU (Jonathan Lassoff)
Tue Feb 5 16:14:02 2013
In-Reply-To: <CAHsqw9vztabKKgJ7NzS7TGQqye_=5QfVoYeLNfeSFV1C6KbsSQ@mail.gmail.com>
Date: Tue, 5 Feb 2013 13:13:50 -0800
From: Jonathan Lassoff <jof@thejof.com>
To: tim.haak@hotmail.com
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Tue, Feb 5, 2013 at 1:10 PM, Jonathan Lassoff <jof@thejof.com> wrote:
> These appear to be an anycasted service, as I reach different destinations
> based on my source address.
>
> Hopefully each deployment has unique origin IPs for their recursive
> queries.
>
Just confirmed this. As these resolvers traverse and query your servers,
they'll have different source IPs, depending on the regional resolver.
Return differentiated DNS responses, based on that.
--j
>
> I would recommend against looking at RIR registration data to determine IP
> location. There's often little to no correlation, there.
>
> --j
>
>
> On Tue, Feb 5, 2013 at 1:01 PM, Tim Haak <thaitim43@hotmail.com> wrote:
>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> Hi,
>>
>>
>>
>>
>> Can a AT&T Uverse/DSL Network Engineer answer a question about the DNS
>> server IPs that are handed out to customers please? I am currently
>> testing from
>> a Florida IP. Can you please let me know if all Uverse and DSL customers
>> across the United States only use these 2 IPs as their primary and
>> secondary
>> DNS servers?
>>
>>
>>
>> 68.94.156.1
>>
>> 68.94.157.1
>>
>>
>>
>> We
>> provide services based on IP GEO-location. Since the 2 recursive resolvers
>> below are registered in Texas every DNS query for any of our records
>> return
>> results that are intended for IPs in that region. In other words, users
>> on the
>> east coast would actually resolve to a central part of the US or west
>> coast IP.
>>
>>
>>
>> Thanks
>> in advance,Tim
>>
>>
>>
>>
>
>
>
