Re: Microsoft's participation in World IPv6 day

[Iljitsch van Beijnum <iljitsch () muada com>]

On 8 jun 2011, at 7:42, Christopher Palmer wrote:

> I'm not an ISP - but I absolutely expect that IPv6 roll-outs have long time-horizons and are fairly complex. So I 
> hope folks are looking at IPv6 NOW, and not simply waiting for Google/Bing/Yahoo/Interwebz to enable permanent 
> content access and organizational justification.

You have to remember that the content guys need few addresses and once they have them they rarely need more, and IPv6 
or not is pretty much a binary thing: yes for everyone, no for everyone. It's the opposite for consumer ISPs: they need 
tons of addresses on an ongoing basis but they can (for instance) give IPv6 to new users while not changing anything 
for existing users. So once some hurdles such as the limited availability of IPv6-capable CPEs and a plan on how to 
provision IPv6 are taken the ISPs have a lot of incentive to roll out IPv6 while the content guys can conceivably stay 
on IPv4 for a long time. The fact that IPv6 client to IPv4 server is an easy problem but the other way around a very 
hard one also points in this direction.

BTW, how are you guys dealing with path MTU discovery for IPv6? I've seen a few sites that have problems with this, 
such as www.nist.gov, but you guys seem ok.