In this configuration, UFW defaults to SSH connection on port 22. You can allow incoming SSH connections to your server using the following command: sudo ufw allow ssh Therefore, you must define rules to allow specific and legitimate incoming connections (such as SSH or HTTP) to the server. To enable the UFW firewall and respond to server requests from external users, we must allow SSH connection. Allowing connection to the server via SSH in UFW Therefore, we need to apply settings for a secure connection to the server in the UFW firewall, which we will explain in the next step. Output Default outgoing policy changed to 'allow'ĭefining these rules for firewalls running on the computer system may be sufficient, but in the server, access by external users cannot be defined as unauthorized. (be sure to update your rules accordingly)Īlso, to allow external connections, enter the following command: sudo ufw default allow outgoing Output Default incoming policy changed to 'deny' As a result, if you want to prevent users from accessing your Debian server, enter the following command to deny incoming connections: sudo ufw default deny incoming To change the default rules, you need to go to /etc/default/ufw to access the UFW policies. To change the default UFW rules, the basic syntax is as follows: sudo ufw default The default policy of UFW is set in such a way that the incoming traffic is not allowed and the outgoing traffic is allowed, that is, it denies access to your server by others, but your server programs are allowed to connect to the outside world. Configuring default UFW policiesĪs you know, the firewall allows users to define certain rules, so you will be allowed to change the default policies of the firewall. Before you enable the UFW firewall, it is better to have settings for connecting via SSH and default policies. This step is optional, but by executing this step, UFW will be configured according to IPv4 and IPv6 port rules after activation. Then press the CTRL + S buttons together to save the configuration and press the CTRL + X, then y and Enter buttons to exit the nano editor environment and reload UFW again to make a new configuration. Then search for IPv4 and IPv6 ports in the output and if you find that these two main ports are inactive, activate these two ports by changing their value to yes. Therefore, for configuration, you must open the UFW configuration file (/etc/default/ufw) using any editor or nano by running the following command: sudo nano /etc/default/ufw Therefore, we must ensure that they are activated in UFW and check whether UFW supports IPv6 and IPv4 firewall rules or not. IPv4 and IPv6 are the main ports that must be enabled. We start the steps of setting up the UFW firewall by updating the Debian repository: sudo apt updateĭebian does not include the UFW firewall by default, so you need to install ufw debian 11 using the apt command: sudo apt install ufwĪfter installing UFW, it is time to enable it, but before enabling UFW, you need to make some settings. Installation steps of UFW firewall in Debian 11 Step 1. To configure and run the debian firewall, you need a Linux VPS running the Debian operating system in addition, you must have sudo non-root user privileges to execute the instructions. So stay with us until the end of the article. The Debian operating system is one of the most popular and famous Linux distributions, and you are well aware of features of Debian Due to the widespread use of Debian and the interest in using the UFW firewall on the Debian operating system, we decided to teach how to install and set up the UFW firewall on Debian 11 in this article. Therefore, many users seek to install and configure UFW firewall on many Linux distributions. As a result, UFW plays a management role by monitoring network connections.Īmong the best Linux firewalls, UFW is preferred by most Linux users due to its great role in improving Linux server and system security. It means that users can define certain connections as allowed in their firewall and allow only those connections to access the network or apply restrictions on incoming and outgoing connections. UFW is the best alternative to configure iptables, which have a relatively complicated syntax.īy using UFW, in addition to restricting network connections, it is also possible to block the network. UFW, which stands for “Uncomplicated Firewall”, is a firewall software that runs on Linux to manage and monitor iptables and set rules in “iptables”. To prevent unsafe and unwanted traffic to the network, users can set rules in the firewall to limit or allow specific traffic. Linux users commonly use firewalls to improve the security of their Linux system, as you know, firewalls control network connections and incoming and outgoing network traffic.
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