[dns-operations] Microsoft NS server oddness

[Mark Pettit]

Nobody from Microsoft ever responded (FWIW).

We were seeing intermittent REFUSED responses from their servers.  I suspected it might be related to the mis-matched TTLs.  Since then, the TTLs have been synced, and we haven't seen the REFUSED problem any more.

On Jun 15, 2012, at 2:54 AM, Chris Thompson wrote:

> On Jun 15 2012, Mark K. Pettit wrote:
> 
>> Can someone from Microsoft please contact me off-list?  We have been noticing
>> a few odd behaviors regarding some Microsoft domains.
>> 
>> Specifically, the TTL of the various address records for the NS-set for
>> microsoft.com are/were not consistent:
>> 
>> ;; ADDITIONAL SECTION:
>> ns1.msft.net.   2480    IN  A     65.55.37.62
>> ns1.msft.net.   42936   IN  AAAA  2a01:111:2005::1:1
>> ns2.msft.net.   2480    IN  A     64.4.59.173
>> ns2.msft.net.   42936   IN  AAAA  2a01:111:2006:6::1:1
>> ns3.msft.net.   2480    IN  A     213.199.159.59
>> ns3.msft.net.   42936   IN  AAAA  2a01:111:2020::1:1
>> ns4.msft.net.   2480    IN  A     207.46.75.254
>> ns4.msft.net.   42936   IN  AAAA  2404:f800:2003::1:1
>> ns5.msft.net.   2480    IN  A     65.55.226.140
>> ns5.msft.net.   42936   IN  AAAA  2a01:111:200f:1::1:1
> 
> What is wrong (technically speaking) with that? The A and AAAA
> records don't have to have the same TTL.
> 
> They do seem to have made them uniformly 3600 st the authoritative
> servers now.
> 
> I could find other things to complain about them, though, such as
> how they don't support EDNS, and the IPv6 addresses seem not to
> be working from here...
> 
> -- 
> Chris Thompson               University of Cambridge Computing Service,
> Email: cet1 at ucs.cam.ac.uk    New Museums Site, Cambridge CB2 3QH,
> Phone: +44 1223 334715       United Kingdom.
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