i have to say that i dont know, but I had a problem with my dsl and "router". I have a dsl cisco 678 modem and I bought a netgear router cuz the red shirt told me to (woops). Apparently the cisco 678 modem is a router (that is it doles out ip addresses) and adding a router confused everything. It turns out i had to return the netgear router and buy just a standard hub. Hope this helps.
i have the same cisco 678 modem.. like you said, it's also a router.. i wonder if you can just set it so it'll only have one local ip and connect another router to that. If not, are there any hubs with wireless capability?