For most people their Comcast modem _is_ their router.
The point of the comment about ipv6 is that if you don't use a Comcast modem/router or they're prohibited by law from snooping on that, Comcast can still sorta understand the number of users from the outside by looking at your ipv6 addresses.
alt Hacker News
The point of the comment about ipv6 is that if you don't use a Comcast modem/router or they're prohibited by law from snooping on that, Comcast can still sorta understand the number of users from the outside by looking at your ipv6 addresses.