said by Just_Dan:
It is still odd to me that they would choose to use a dynamic routing protocol with a /30, instead of assigning their single IP customers one address in a /24, but that would be a policy decision, and I am sure it makes sense to the folks behind the scenes.
The single IP address method is what I used to see with AT&T for my DSL circuits with a single IP address option. AT&T did it using their PPPoE authentication (which Comcast does not use). Comcast could do it using MAC address authentication (which is a standard feature in any DHCP service), but I suspect they don't want to get involved with keeping up with the hassle of having to manually update the DHCP server(s) every time a customer gets a new router, or PC, or changes a NIC. By limiting static IP assignments to a specific router that they supply, they eliminate a lot of maintenance headaches for their support people.--
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We need to witness our own limits transgressed, and some life pasturing freely where we never wander.