Re: implications of 6to4 for v6coex

[Nathan Ward <v6ops@daork.net>]

On 3/10/2008, at 2:26 AM, Erik Kline wrote:
> On Sun, Sep 21, 2008 at 7:12 PM, Brian E Carpenter
> <brian.e.carpenter@gmail.com> wrote:
> > On 2008-09-20 12:54, Nathan Ward wrote:
> > > On 20/09/2008, at 12:15 PM, james woodyatt wrote:
> > > > There is clearly something broken about 6to4, and I'm not sure  
> > > > how to
> > > > fix it.  Can it be saved as a standard?
> >
> > Just to be clear, the issue is not with basic 6to4, which was  
> > intended
> > to be implemented only in routers. It's with the "obvious" extension
> > to allow host-based 6to4, which led fairly quickly to the notion
> > of anycast relays and the resulting lack of both configuration and of
> > a discovery protocol.
>
> Well it seems to be working well enough (or popular enough, anyway).
> What if I said that 69.8% of IPv6-enabled users who visit google.com
> have 6to4?


So, Brian disagrees with the host based 6to4 thing, ie. the way  
Windows Vista and XPSP2 do it.

I don't think that the anycast relays has anything to do with the host  
based stuff. It might have been related thought trains in peoples'  
minds in 2001, but the anycast relays are just as relevant to router- 
based 6to4 as they are to host-based 6to4.

For example, Airport Extreme, Linksys RVS4000, Cisco 8XX+config, etc.
So, it's not just Windows.

I'm not so hot on 6to4 stacks in hosts either, but my problem is wider  
- it is more with automatically configured 6to4, which is not specific  
to hosts.

My feeling is still that this whole relay stealing thing is a non- 
issue in current implementations, I'll write up in a draft with some  
recommendations to remove that paragraph and bring it in line with  
most existing deployments.



Also, these stats are interesting, and are roughly the same as what  
I'd expect.
So, my understanding is that this test is to a hostname with A and  
AAAA records, right? That would make sense, as Teredo will only be  
used by XP SP2 and Linux boxes who have Teredo enabled (Vista prefers  
A over AAAA if it only has Teredo IPv6 connectivity).

I don't think that you can accurately say that that you tested all  
IPv6 enabled users, because you aren't testing whether they are Vista  
and have Teredo enabled. Point em at a hostname with only AAAA and my  
expectation is that you'll significantly see different results - close  
to what I see, which are like:
- ~90% Teredo
- ~7-8% 6to4
- rest Native

--
Nathan Ward