Router to handle multiple public IP addresses.

Answer 1

This can't be done on a Linksys router with stock firmware. It can be done if you load a third-party firmware, but there's no GUI (afaik) to accomplish it, so you'll be hacking system shell scripts which is pretty hairy. I would recommend getting a low-power or older PC and installing PFSense.

PFSense is an open-source router appliance OS distribution with a very easy to use web front end.

Answer 2

Install DD-wrt On your linksys box. I believe this will have everything you need link text