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

Nathan Ward nanog at
Tue Feb 16 06:50:46 UTC 2010

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.
> <>
> "Of the users getting v6 only gif from non-tunnel-space, 58% were from Proxad ( 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

More information about the NANOG mailing list