[ntp:questions] NTP over IPv6 with Teredo

Danny Mayer mayer at ntp.isc.org
Sat Feb 23 03:36:23 UTC 2008

Ronan Flood wrote:
> On Mon, 18 Feb 2008 02:59:58 GMT, mayer at ntp.isc.org (Danny Mayer) wrote:
>>> Being a UK client, using a Teredo server on the west coast of the US
>>> probably doesn't help, but it could also be inherent latency in Teredo.
>> You might ask why they have configured their NTP server to go to the 
>> west coast of the US in the first place, irrespective of Teredo since 
>> network wise it a much longer distance than say some other location in 
>> London.
> The NTP servers are in the UK.  As for the Teredo server, that's
> teredo.ipv6.microsoft.com, which I'd guess is the most well known
> owing to its use in Windows Vista et al.

I just knew you were going to tell me that! Can you set a local/domain 
policy not to use that Teredo server? There is a registry setting to 
turn this off in Vista:
netsh interface ipv6 isatap set state state=disabled

Search for isatap in the KB.


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