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Is there any NECESSARY application for installing a firewall in Linux?
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quetz,
Linux comes with some basic firewalling software/features. If you want to configure the firewall, you can use commands for ipchains (kernel 2.4) or iptables (kernel 2.6). But the easiest way would be to use a GUI like Firestarter
http://fs-security.com
Hope that answers your questions.
LM