Re: 6to4 being replaced by Teredo only? [Re: Tunneling scenarios and mechanisms evaluation]

[Brian E Carpenter <brc@zurich.ibm.com>]

Christian Huitema wrote:
> 
> > -----Original Message-----
> > From: owner-v6ops@ops.ietf.org [mailto:owner-v6ops@ops.ietf.org] On
> Behalf
> > Of Erik Nordmark
> > Sent: Tuesday, March 16, 2004 4:17 PM
> > To: Rob Austein
> > Cc: v6ops@ops.ietf.org
> > Subject: Re: 6to4 being replaced by Teredo only? [Re: Tunneling
> scenarios
> > and mechanisms evaluation]
> >
> > > Terado is excessively complex for the case of a user who wants IPv6
> > > capability from an IPv4-only ISP and has the ability to replace the
> > > NAT box.  Yes, Terado could probably be used in this case instead of
> > > 6to4; pigs also fly just fine, given sufficient thrust [RFC1925],
> but
> > > that doesn't make either of these a good idea.
> >
> > Since I feel responsible for triggering Pekka's question let me
> > try to explain myself.
> >
> > In a world with native, 6to4, and teredo we need to be concerned with
> > the operational issues of gettting relays deployed to enable
> communication
> > between the 3 different universes:
> >  - native to/from 6to4
> >  - native to/from teredo
> >  - 6to4 to/from teredo
> >
> > Can we simplify the deployment of these so that we can reduce the
> > likelihood of ending up with a partitioned IPv6 Internet?
> 
> In fact, Teredo will work if we have:
>   - native to/from 6to4
>   - native to/from Teredo
> You will simply get 6to4-native-Teredo.

I fully agree. I think we should use native IPv6 as the "lowest common
denominator" (although "lowest" is perhaps the wrong word :-). This seems
to give a much better exit strategy from coexistence.

   Brian

> 
> Note that we are also deploying host-based Teredo relay in the next
> Windows XP service pack. A dual-stack Windows host with either 6to4 or
> native connectivity will know how to send packets to Teredo peers using
> Teredo over UDP and IPv4, effectively offloading the network based
> Teredo relays.
> 
> -- Christian Huitema