How do I use multiple WAN interfaces with IPCOP?

As of the current version (1.4.x series), IPCOP does not support multiple WAN interfaces. While it is possible to hack IPCOP to use multiple WAN interfaces, you will most likely do more damage to the Iptables in the process. Other firewall products, such as Pfsense, do support multiple WAN interfaces. There are hints that next version of IPCOP will support multiple types of the same interface.