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The word "How?" springs to mind at this point.
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I was poking around for building small tcp/ip devices, and discovered there are a few tcp/ip/ethernet components available that litereally aren't much bigger than the plug. combined with some very small fpga or other components, it might be possible to make a plug device that looks like a DSL-phone-adapter,
but which provides a small firewall for your laptop while travelling... keeping the beasties out when you plug in to a strange network.
Something like this?
[DrCurry, Aug 29 2005]
Lantronix Inc X-port
Programmable RJ45 socket with a built-in webserver, and programmable. [Dub, Aug 29 2005]
||X-Ports...I've got a few... they're sockets though... You can program'em in c/pascal.
||Linux doesn't need a firewall. I could never understand why windows programmers would allow external connections to influence your computer.