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Host Firewall Installation and Configuration
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= Introduction =

It is recommended to use a simple host firewall and deny any incoming connections on all ports. [https://gufw.org/ gufw] provides a simple graphical user interface for the [https://wiki.debian.org/Uncomplicated%20Firewall%20%28ufw%29 Uncomplicated Firewall] program. <ref>
Uncomplicated Firewall by itself only provides a command-line interface for managing the netfilter firewall.
</ref> It is easy to perform common tasks like blocking or allowing P2P, individual, or pre-configured ports.

= How-to: Install and Configure a Firewall =

The following steps install [https://packages.debian.org/stable/gufw gufw on a Debian host].
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'''1.''' Install gufw.

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sudo apt update && sudo apt install gufw
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'''2.''' Start gufw.

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gufw
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'''3.''' Press <code>Unlock</code>. Enter the password.

'''4.''' Press <code>Enabled</code>. <ref>The firewall is disabled by default.</ref>

'''5.''' Check the settings.

By default, the settings should be <code>Incoming: Deny</code> and <code>Outgoing: Allow</code>.
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Although not recommended, it is possible to add special firewall rules, use pre-configured options for common programs and services, or set other advanced options in gufw by following [https://help.ubuntu.com/community/Gufw this guide].

For further information on firewalls, see [[Host_Firewall|here]].

= References =
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[[Category:Documentation]]