All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria. Before you invest the time in setting up a firewall, we recommend monitoring your connection for suspicious activity. For that we like NukeNabber , free from Puppet's Place . NukeNabber sets itself up to listen on TCP and UDP ports commonly attacked over the Internet. A total of 50 ports can be monitored simultaneously.
Ports are sockets for logical connections.
The port number identifies what type of port it is. For example, port 80 is used for HTTP traffic. It's important to remember that most people don't need to worry about attacks by hackers. Unless your computer contains state secrets, bank records, or Beastie Boys tickets, you've got nothing to worry about. All rights reserved.