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Adam Kalsey

This is the blog of Adam Kalsey. Unusual depth and complexity. Rich, full body with a hint of nutty earthiness.

Security & Privacy

Personal firewall advantages

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This blog post is over 21 years old. It's possible that the information you read below isn't current and the links no longer work.

9 Oct 2003

Another thing a software firewall can do that a NAT router cannot is protect computers on your network from the other computers on your network.

If one of your computers gets compromised or infected, or if a user on your network decides to be malicious, a NAT router won’t help you one bit. Traffic between computers on your network doesn’t pass through NAT, so a worm on one computer can infect all the other computers. A hacker who gains access to you network can then attack any machine on your network. If you have a wireless access point on your network, anyone connecting to it is immediately behind your NAT router and can connect to your other computers.

A software firewall like ZoneAlarm, Outpost, or Norton Personal Firewall can prevent such intrusions from your own network.

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