said by koitsu:
I will gladly admit I don't know enough about the E3200's native firmware to know if it will show you both the advertised /64 and the individual /128 announced by Comcast. Some routers show this, others do not. Here's an example of one which does:
Ah okay, on the Local Network tab it shows:
Prefix Address: 2601:d:3000:44::/64
Does that offer any additional insight?