Our service is DSL but a quick peek at the FAQ for this modem says you can use USB or up to 100MB Ethernet. You should be fine plugging it by Ethernet directly into your router.
I didn't dig deep enough to definitely answer your second question but it should not be a problem. It may pass on a 'real' Internet address that your router will 'route' to your local 168 network. If not you may have to tweak a bit but the setup looks like it will walk you through this step.
Last edited by Murph; 04/27/09 06:39 PM.
