How do I setup multiple of the same type of interface?

As of the current version (1.4.x series), IPCOP does not support multiple types of the same interface. While it is possible to create more than one of each interface, you will most likely do more damage to the Iptables in the process. Extra Interfaces allows you to create up to four (4) additional Grey interfaces. Pfsense does support multiple NICs of any type (32 at maximum). There are hints that next version of IPCOP will support multiple types of the same interface.