gateway and dns are probably (well, usually) 192.168.1.1
Not always. Gateway IP depends on how your router is configured, quite a lot use 192.168.x.x as a default setting. Mine came with 192.168.0.254 as default. As for DNS, you can use your routers IP, as long as the router does DNS forwarding etc, otherwise you'll usually need to use whatever DNS IP's your ISP gives you.
Most 'pre-configured by your ISP' routers will have DHCP enabled, so you can give that a try if Genesis/Miami/AmiTCP supports it (they probably do, but I can't remember).
