The DShield organization, which appears affiliated with the SANS Internet Storm Center, collects information about what attacks are being seen at computers. If you have a broadband internet connection (DSL or cable modem), you really need a firewall. And if you have a firewall, it should be set to generate a log of incoming and outgoing communication attempts.
The DShield site puts received data into a database so they can analyze attacks. They also have a list of how to send the data for various firewalls. The site also has links to third-party solutions.
DShield describes this as a distributed intrusion detection system, since tons of people pitch in from all over the globe.
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