Linux is highly secure, but you should still have a firewall. You should know if your ISP's hardware (gateway) uses a firewall. One of the easiest Linux firewalls is UFW and its GUI sidekick, GUFW.
If you haven’t checked out Endian Firewall yet, download the code and give it a try. Endian Firewall is a packaged Linux security distribution that combines several open source firewall, VPN and ...
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