Host Firewall Basics

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Host Firewall Installation and Configuration

Introduction

It is recommended to use a simple host firewall and deny any incoming connections on all ports. gufw provides a simple graphical user interface for the Uncomplicated Firewall program. 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 gufw on a Debian host.

1. Install gufw.

sudo apt update && sudo apt install gufw

2. Start gufw.

gufw

3. Press Unlock. Enter the password.

4. Press Enabled.

5. Check the settings.

By default, the settings should be Incoming: Deny and Outgoing: Allow.

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 this guide.

For further information on firewalls, see here.

References

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