Teredo sunset - did it happen?

Phil Mayers p.mayers at imperial.ac.uk
Mon Nov 17 17:55:06 CET 2014

On 17/11/2014 16:40, Jeroen Massar wrote:
> On 2014-11-17 17:38, Phil Mayers wrote:
>> On 17/11/2014 16:23, Jeroen Massar wrote:
>>> What are you trying to achieve by blocking that port?
>> I honestly don't know why you want to talk about other things, but I've
>> no interest in discussing them with you.
> Then don't make statements that you are blocking them...

In the interests of the principle of charity - I am trying hard to 
assume good motives on your part - let me try again...


We've historically blocked Teredo, for probably erroneous reasons. I'd 
like to unblock it, to specifically let XBox One consoles use their new 
Teredo stuff.

At the same time, I'd like to avoid even the possibility of triggering a 
behaviour change on Microsoft Windows clients. I had thought Teredo was 
sunsetted, but examination of my Windows 7 PC suggests it is not, 
although it is broken.

To inform my decision about unblocking it, I'd like to ask a few questions.

Does anyone know why Teredo has not been sunsetted yet?

Does anyone know when Teredo will be sunsetted?

Does anyone know of a safe way to block Teredo from Microsoft Windows 
clients, but leave Teredo from XBox One unaffected? Jeroen, your 
suggestion of blocking the DNS name is a good one. Anyone any other 
ideas I should also consider.


Hopefully this is specific enough...

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