Published at LXer:

A sensible firewall is your computer's first line of defense against network intrusion. When you're at home, you're probably behind a firewall built into the router supplied by your internet service provider. When you're away from home, though, the only firewall you have is the one running on your computer, so it's important to configure and control the firewall on your Linux computer. If you run a Linux server, it's just as important to know how to manage your firewall so that you can protect it from unwanted traffic both locally and remotely.read more

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