[dns-operations] Karl Auerbach on adding 'millions' more TLD - what do folks think about the operational impact?

Lutz Donnerhacke lutz at iks-jena.de
Tue Jan 9 21:43:57 UTC 2007

* Lutz Donnerhacke wrote:
> * Mark Andrews wrote:
>> 	All vendors should be supporting DNAME by now.  It's only been
>> 	around 7 years (August 1999) on standards track.
> Microsoft does not. The hotfix for WinXP DNAME errors is to disable DNAME
> handling.

To make it a bit more clear: Microsoft DNS-code can't serve DNAMEs and also
can't resolve DNAMEs at all. Since DNAME processing was enabled in W2KSP2,
the DNS parser fails on every DNAME record and discards the whole packet.
That's why DNAMEs can't be resolved at all in W2K and WXP enviroments.

There is a hotfix for Microsoft DNS: The DNAME code is changed to an value
in the experimental range and the parser did not recognise the records

In short: Using DNAME in your zone ensures that your names are unreachable
in networks running Microsoft DNS (the vast majority of companies).

More information about the dns-operations mailing list