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Grab one of those cheap $100 netbooks and throw Linux on it with the server software. The purpose of this would only be to avoid being an "open" network. You can, obviously run the netbook only at the times when you need to connect, and you can take it with you easily. At home, you can fiddle with most routers and create a routing table that only allows that specific MAC address to connect to any given port, without knowing the router brand and model I cannot say where you will find that, but look for things like "static" routes and maybe a NAT table, search around and you can find it.
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