Re: [v4v6interim] "IPv4->IPv6 is hard"

Fred Baker wrote:
>
> On Oct 17, 2008, at 11:29 AM, Ed Jankiewicz wrote:
>
>> yup.  I really meant to say "right now" and even for the near future, 
>> don't we still expect most servers/applications to be dual-stack 
>> rather than IPv6-only?  My point was there are more pressing problems 
>> to solve, while it would be nice for all variations to work, some can 
>> be deferred.
>
> One has to define "dual stack".
>
> Everything that runs on my Mac is potentially dual stack, in the sense 
> that the code is there to run both IPv4 and IPv6. Present it with an 
> IPv4 network, it does so. Present it with an IPv6 network, it does so.
>
> It the thing it needs to talk with is IPvX and it only has IPvY 
> routing, however, it can't get there. From my home I can't access 
> ipv6.google.com because no ISP in Santa Barbara County runs IPv6.
>
> The DS-Lite model says that I should set up a tunnel across the IPv4 
> infrastructure, whether from my host or from my router; 6to4 is 
> similar, as are others.
Actually, the DS-Lite model targets setting up a tunnel to cross 
IPv6-only infrastructure - so, not very useful for you situation with an 
ISP not delivering IPv6.

- Mark
>
> The translation model says that the host should use the network 
> available to it and something in the network should change the 
> protocol when and where it must.
>
> My personal preference is for dual stack deployment, and where 
> necessary to change as little as possible, as the changes will outlive 
> the need for them by decades. Asking the host to build tunnels is an 
> example of such a change. Under the ISP's control or at least in 
> collusion with it, I can see building tunnels. But even there, as the 
> ISPs deploy IPv6 that becomes a change that will outlive the need for 
> it. That's why I'm working on translation - enable the network 
> administration to install what it needs to when it needs it, and 
> enable it to remove it when the need goes away.
>
> my two yen
>
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