An old 386 with linux/bsd installed will work perfectly as a shield against trojans listening on a port. Almost everyone will have such a system lying around somewhere, and most free *nix distro's will have firewalling preconfigured.

For this setup to be circumvented, a trojan will have to actively connect to some host, in order to be accessed.

(Which will probably be the next step in advanced trojans)

Sander.

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