Denic (.de) blocking 6to4 nameservers (since begin feb 2010)

[nanog at daork.net (Nathan Ward)]

On 16/02/2010, at 7:47 PM, Mikael Abrahamsson wrote:

> On Tue, 16 Feb 2010, Nathan Ward wrote:
> 
>> XP won't ask for AAAA unless it has non-Teredo connectivity though I don't think.
> 
> That doesn't compute considering all the XP machines with Teredo addresses that asked for my AAAA only content.
> 
> <http://www.ops.ietf.org/lists/v6ops/v6ops.2008/msg01582.html>
> 
> "Of the users getting v6 only gif from non-tunnel-space, 58% were from Proxad (free.fr I believe), and then on the list came UNINET, SUNET, FUNET (university networks in .no, .se and .fi) and Hurricane electric.
> 
> 98% of Teredo users run Windows XP.
> 88% of 6to4 users run Windows Vista."
> 
> So 98% of Teredo users getting the v6only content (using DNS) was using WinXP, so it does seem it does AAAA lookups.

I mean non-Teredo connectivity in addition to Teredo.

Perhaps they have Teredo and 6to4, and could not reach you via 6to4 so instead used Teredo, or, any number of scenarios.

--
Nathan Ward