-----Original Message----- From: Owen DeLong [mailto:owen@delong.com]
In my perception, this is primarily a moving part that will be used by providers deploying IPv6 as a mechanism to compensate for things on the internet their customers want to reach that have not yet deployed IPv6.
I think it will be used mostly as the middle 4 in NAT444 and in links between networks where there are RFC1918 network assignment collisions. My gut tells me we will see that net block being used for NAT on a lot of VPNs between RFC1918 networks.
I don't think any sane provider will use this as yet another way to avoid deploying IPv4.
I hope you're right.
OTOH, the number of not sane providers is somewhat scary, but, hopefully not of sufficient critical mass as to be meaningful in the long term.