Not sure why but #Xfinity seems to now need a 10.0.0.1 network while moving modems. my 192.168.0.X did not work, but sprang to life the moment the LAN was switched.
@hamner are they still running rogue wireless APs on equipment installed in customer homes? maybe they've co-opted some private IP subnets for that, and it's confusing their router (assuming you are using their router... you might outta consider using your own if you can)
@hamner are they still running rogue wireless APs on equipment installed in customer homes? maybe they've co-opted some private IP subnets for that, and it's confusing their router (assuming you are using their router... you might outta consider using your own if you can)