Ryan, Thanks for the reply. I was a bit confused, since I'd had at least two other routers used in this way, and never had a problem. However there are a number of possible unknowns, including...

I have a 1500 foot ethernet <-> optical <-> ethernet bridge from my cable modem to my house. The ethernet interfaces are 10/100 as that seemed sufficient at the time I put in the system, and is still...