Back to my mac and cable modem

I can't find a definitive answer to this question. Is there a cable modem that is compatible with Comcast that supports Back to My Mac?
Right now we have Comcast for business with fixed IPs, so I have just been using afp:// and vnc:// to access my home mac while on the road. But in the interest of saving $$$, I want to switch to Comcast for home, which doesn't offer fixed IPs.
The last time I tried (with Mavericks), I could not connect to any computer at home through Back to my Mac because the Comcast-supplied modem didn't support Upnp (Universal Plug and Play). A brief search could not find any cable modems that do support Upnp. Am I missing something, or should I give up on the idea?

Is there anyone out there who uses Back to My Mac (for sharing files and screens) and a cable modem? If so, how well does it work? Did you get a special modem or just the cheapest one that you could find?

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