I was recently looking into purchasing 2 1841 Routers for our organization, but was having a problem with one of its features. I see that there are 2 Ethernet interfaces and room for expansion. This is great to hear, but I was wondering if I can expand the Ethernet ports as one router will take the internet connection in, spawn a trunk connection, and then communicate with an existing LAN. I see there are 4 port etherswitch HWIC expansion modules, but HWIC isn't for WAN connections? Would I be able to use those ports like a LAN connection?