teredo.ipv6.microsoft.com off?

Ignatios Souvatzis ignatios at cs.uni-bonn.de
Mon Jul 15 08:52:19 CEST 2013

On Sat, Jul 13, 2013 at 10:39:12PM +0300, Tassos Chatzithomaoglou wrote:

> At the same time, i'm thinking out loud...
> Why would a windows application send an a request to an IPv6 DNS
> server over native IPv6 in order to find the IPv4 address of a
> server and get IPv6 over IPv4 connectivity?

Why not? Thinking "in order to" is wrong... it's just a database

It just happens that in this case, asking over IPv6 can't work.
But this should be no problem as the database lookup will be repeated
over other transports until it succeeds.

In the general case, you don't know whether connectivity to address X of
type Y is possible until you try it, and unfortunately, sometimes only 
after a time-out period has passed without answer. 


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