Amusingly even if the Comcast LAN prefix is static most operating systems by default will cycle your address anyways. In IPv6 a dynamic address is now a Feature!
Whether or not the Comcast LAN prefix changes is a good question though. I've seen no evidence that they plan to deliberately change them. My Comcast IPv4 address stays static pretty much until I reset my modem and even then it often grabs the same v4 address again.
I did a bit of really basic testing earlier today and no amount of modem resetting seems to cycle the IPv6 prefix I am getting delegated.
In the end though, dynamic DNS does a very good job of dealing with the occasionally changing prefix and IPv6 gets rid of the need to do port forwarding so maintaining dns records with public addresses to machines on your home network is actually possible now. I am happy to report that (with the proper firewalls in place) it is downright awesome to have IPv6 at home and at work and on your phone. I can't wait to see what sort of new home cloud tech this will enable.
Whether or not the Comcast LAN prefix changes is a good question though. I've seen no evidence that they plan to deliberately change them. My Comcast IPv4 address stays static pretty much until I reset my modem and even then it often grabs the same v4 address again.
I did a bit of really basic testing earlier today and no amount of modem resetting seems to cycle the IPv6 prefix I am getting delegated.
In the end though, dynamic DNS does a very good job of dealing with the occasionally changing prefix and IPv6 gets rid of the need to do port forwarding so maintaining dns records with public addresses to machines on your home network is actually possible now. I am happy to report that (with the proper firewalls in place) it is downright awesome to have IPv6 at home and at work and on your phone. I can't wait to see what sort of new home cloud tech this will enable.