They are phasing it out but I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. We've seen cases here where they have been able to get this accomplished for customers even when it is not listed in their rate cards, YMMV. You should get a reply here in your topic. Good luck !
Hello Lucius-Warbaby. Thanks for visiting and posting on our Forum. I can assist with reviewing the availability of purchasing service for an additional dynamic IP address on your account, for that second port on your modem. Please send me a private message and include your full name so I can access your account.