I have a /30 WAN connection network, and a /24 public IP space for use at my/our discretion. The /24 sits behind the /30. The upstream provider router is set such that the /24 is reachable through my side of the /30. Is it possible Comcast is assuming this for your setup as well? Caveat(s): I don't have Comcast, and I don't know much about them. We use AT&T ADE, which is a straight L2 point to point metro Ethernet circuit. Our internet provider is the telecommunications department of our overall organization and not AT&T. But anyway (there are other trunks on my circuits, and a redundant circuit to a 2nd location, but that's beyond the scope of this discussion)
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