You can check UFW status with: sudo ufw status Note: You can install UFW on Arch Linux with sudo pacman -S ufw, but you also need to enable the UFW systemd service with sudo systemctl enable ufw. UFW is usually pre-installed on Debian/Ubuntu/Linux Mint, although you can always run the following command to install it. Getting Started with UFW on Debian/Ubuntu/Linux Mint Server If it’s running, you can stop and disable it. This iptables service is shipped with iRedMail to restore iptables firewall rules. If you have set up your mail server using iRedMail, be sure to run the following command to check whether the iptables service is running. Sudo systemctl disable iptables-persistent You can check whether it’s running with the following command.

Iptables-persistent is a well-known iptables restore service on Debian/Ubuntu. If you were using iptables firewall directly and now you want to switch to UFW, you just need to disable your iptables restore service. If there are two restore services, they will conflict with each other, which often results in web applications not available after system reboot. Before using UFW, it’s important that you check whether there’s another iptables restore service on your system. UFW by default restores firewall rules after system reboot.

Another well-known iptables front-end is firewalld, which is the default firewall application on RPM based Linux distros (RHEL, CentOS, Fedora, OpenSUSE, etc).ĭisabling Other Iptables Restore ServicesĪs you probably know, iptables firewall rules will be flushed when the OS shuts down and the iptables program itself does not restore the firewall rules. By default, UFW set firewall rules for both IPv4 and IPv6 address. UFW is the recommended iptables front-end on Debian based Linux Distros and is usually pre-installed on these distros.

It is particularly well-suited as a host-based firewall. It provides a command line interface with syntax similar to OpenBSD’s Packet Filter. UFW is a front-end for iptables, to make managing a Netfilter firewall easier, hence the name “Uncomplicated Firewall”. This article intends to get the reader started with UFW, but does not explore the ins and outs of UFW. Managing firewall is a basic skill that every system admin needs to know. This tutorial is going to show you how to use UFW (Uncomplicated FireWall) on Debian/Ubuntu/Linux Mint with some real-world examples.

Ubuntu iptables