Broadband routers and modems generally ship with a hardware firewall, configured for maximum security and with options that will apply to any computer that you connect to your network. It's up to you to configure your hardware firewall to allow incoming traffic. If you enable incoming traffic for a particular computer, you should then install and use a powerful software firewall to protect your computer within the local network.
PC Tools Firewall Plus 1.0 is a new firewall designed for home users to install on an individual computer and configure to allow or disallow incoming (and outgoing) Internet traffic. You can monitor the traffic and the firewall will also warn you if an application is attempting to connect to the Internet, through your network.
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