Bridging ISP gateways is all fun and games, until it's reset or updated and reverts back to non-bridge mode and then you have two routers handing out IPs and double NAT.

For this reason, i usually leave the Comcast/Verizon router in factory default mode. I put my router behind it on a different subnet and run everything in the house off of that. I also put my router in the DMZ of the ISP device and all port forwards and remote access work perfectly fine. This way if the ISP factory defaults their router we should still be good to go.