[ipv6calc] Re: [IPv6 Users] Teredo client brokenness: link-local destination ?

Peter Bieringer pb at bieringer.de
Sat Aug 11 14:06:22 CEST 2007

Hi Miguel,

At 11.08.2007 13:46, Miguel A. Diaz wrote:
> Hi, 
>> -----Mensaje original-----
>> De: Peter Bieringer [mailto:pb at bieringer.de] 
>> Enviado el: sábado, 11 de agosto de 2007 9:15
>> Para: miguelangel.diaz at consulintel.es; Pekka Savola
>> CC: Maillist ipv6calc
>> Asunto: Re: [IPv6 Users] Teredo client brokenness: link-local 
>> destination ?
>> Hi,
>> At 09.08.2007 00:07, Miguel A. Diaz wrote:
>>> I've also saw similar packets but the link local address used is 
>>> different. It's always fe80::8000:5445:5245:444F. As curiosity,
> the 
>>> corresponding ASCII characters of the last part of the 
>> link-local ID 
>>> field is:
>>> 54 45 52 45 44 4F ==> TEREDO
>> Just for your information, current cvs version of ipv6calc 
>> now detects such adddress as "link-local-teredo"
>> @Miguel: do you know which client uses such addresses?
> I'm not really sure but I guess it's Microsoft's Teredo client because
> the big number of packets captured. I assume that Microsoft's client
> is the predominant implementation because the number of PC with
> Windows as OS. Furthermore, the new Vista has been released with both
> IPv6 and Teredo enabled by default (Teredo works if no native IPv6
> connectivity is detected). This assumption seems to be confirmed
> because I've googled and I can see a lot of references with link-local
> address as fe80::8000:5445:5245:444F for the Teredo interface on
> Windows.
> I've also detected that the link-local address fe80::ffff:ffff:fffd is
> also used by Microsoft's Teredo client. I don't really know why
> Microsoft's Teredo implementation uses both link-local addresses.
> Maybe it depends on the SP or OS version.

It would be interest, whether there is a difference between IPv6-enabled
W2K and Vista.

BTW: I've added this IID now also to ipv6calc's ll-teredo detection.

Dr. Peter Bieringer                     http://www.bieringer.de/pb/
GPG/PGP Key 0x958F422D                       mailto:pb at bieringer.de
Deep Space 6 Co-Founder and Core Member  http://www.deepspace6.net/
Xing/OpenBC                 http://www.xing.com/hp/Peter_Bieringer/

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