Windows XP has a feature called network bridging that allows you to connect two networks together. If you attach two networks to your computer (for instance, you have a wired Ethernet adapter and a wireless network adapter installed on the computer), by default XP will bridge the networks so you can access one from the other. This is convenient but less secure.
To prevent bridging:
When you run the Network Setup Wizard, you'll get a message that your computer has multiple connections.
Click "Let me choose the connections to my network."
Click Next.
In the "Select the connections to bridge" dialog box, uncheck the boxes for all but one of the listed network adapters.
Click Next and finish the wizard. A bridge will not be created.

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