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

[Miguel A. Diaz]

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.

Regards
Miguel




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