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Make sure the router is a wireless router. Its useless having a wireless nic when it can't receive any information traffic.
Also when comes to wireless consider security (though it might seem impossible but hey why take the chance). Make sure the router is a wireless router with an input for your DSL modem. Normally the router (wireless) only accepts RJ-45 connections, so if your DSL modem is a USB type, your best chances are:
- remove the order of the router and get two wireless network cards so you can setup a peer-to-peer network (that means the pc with the modem connected to must be on for the upstairs pc to run)
- get a DSL modem which is RJ-45 interface
- bring the modem upstairs and hook it up to that pc if you want to use the net upstairs.
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