said by gibwar:
I'm using DHCPv6 (stateful configuration) at this time so I can see which devices are registering IPv6. When I switch to stateless configuration the temporary address shows up and changes as expected.
As to why I didn't get one with the Comcast 2001:558 address, I'm guessing it doesn't work with the /128 prefix (which makes total sense as I type this, no room for a privacy address, duh).
Based on the information posted previously, I am assuming that the device getting the Comcast 2001:558 address is a device connected to the SMC gateway's LAN using DHCP. Since that IP address prefix is used by Comcast for router WAN interfaces and/or standalone PC type devices that are not behind a router, it really is a strange anomaly.
When I was using my SMCD3G with a static IPv4 block, the only Comcast IPv6 implementation I could get was using Comcast's 6to4 tunnel with devices that had a public static IPv4 address and were either directly connected to the SMC gateway, or were behind my Netgear router that had a static IPv4 WAN address and was setup to be a 6to4 relay through Comcast's tunnel. Those devices however, received an IPv6 address beginning with the expected "2002" prefix.--
We can never have enough of nature.
We need to witness our own limits transgressed, and some life pasturing freely where we never wander.