CSF (ConfigServer Security & Firewall) is a popular firewall configuration script created to provide better security for servers while allowing legitimate users and processes. In this guide, we will walk through the steps to install CSF Firewall on Debian 11.

Step 1: Update Your System

Before installing CSF, ensure your system is up to date:

sudo apt update && sudo apt upgrade -y

Step 2: Install Required Packages

Install required packages for CSF:

sudo apt install -y perl libwww-perl liblwp-protocol-https-perl

Step 3: Download CSF

Download the latest version of CSF:

wget https://download.configserver.com/csf.tgz

Step 4: Extract the CSF Archive

Extract the downloaded CSF archive:

tar -xzf csf.tgz

Navigate to the CSF directory:

cd csf

Step 5: Run the CSF Installation Script

Run the installation script:

sudo sh install.sh

Step 6: Configure CSF

After installation, you need to configure CSF. The main configuration file is located at /etc/csf/csf.conf. Open it with a text editor:

sudo nano /etc/csf/csf.conf

Make necessary changes to the configuration according to your needs. For example, you can set TESTING = "0" to disable testing mode.

Step 7: Restart CSF

Restart CSF to apply the configuration:

sudo csf -r

Step 8: Check CSF Status

Check the status of the CSF firewall:

sudo csf -s

Conclusion

You have successfully installed CSF Firewall on Debian 11. This firewall will help protect your server from various attacks while allowing legitimate traffic.

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