Most tutorials out there walking people through their initial VPS configuration recommend using ufw to set up their basic server firewall. UncomplicatedFirewall is a frontend wrapper around iptables aimed at making it easier for users to set up Linux firewalls.
Since ufw just makes changes to the iptables you can use the Linux Firewall module to view its rules. Go to configuration of Linux Firewall module and set the Directly edit firewall IPv4 rules instead of save file? setting to Yes in the IPv4 configuration section. Your ufw rules are in the Chain ufw-user-input chain. I couldn't find the rules in /lib/ufw on a recent installation of UFW. /etc/ufw seems to be the right place, – Chetan Bhargava Jan 12 '18 at 5:23 1 This answer is no longer correct. Apr 25, 2015 · It's called UFW (Uncomplicated Firewall). Although UFW is a pretty basic firewall, it is user friendly, excels at filtering traffic, and has good documentation. Some basic Linux knowledge should be enough to configure this firewall on your own. Aug 24, 2018 · # ufw allow 2000:3000/tcp # ufw allow 2000:3000/udp If you want to block access to port 22 from IP 192.168.0.4 and 192.168.0.10 but allow all other IPs to access to port 22, run the following command: # ufw deny from 192.168.0.4 to any port 22 # ufw deny from 192.168.0.10 to any port 22 # ufw allow from 192.168.0.0/24 to any port 22 ufw disable && ufw enable && ufw status It's a bit of a work around but its tested and works with 14.04. This worked for me updating the configuration files without disrupting the firewall.
$ sudo ufw allow 22 $ sudo ufw allow 80 $ sudo ufw allow 443. So, this is the most basic way to add a rule in the ufw firewall. However, we can make these rules more specific by defining the IP address or a subnet along with the port number and the type of connection (TCP, UDP).
Aug 24, 2018 · # ufw allow 2000:3000/tcp # ufw allow 2000:3000/udp If you want to block access to port 22 from IP 192.168.0.4 and 192.168.0.10 but allow all other IPs to access to port 22, run the following command: # ufw deny from 192.168.0.4 to any port 22 # ufw deny from 192.168.0.10 to any port 22 # ufw allow from 192.168.0.0/24 to any port 22
Apr 25, 2015 · It's called UFW (Uncomplicated Firewall). Although UFW is a pretty basic firewall, it is user friendly, excels at filtering traffic, and has good documentation. Some basic Linux knowledge should be enough to configure this firewall on your own.
Once the testing repository has been enabled, UFW can be installed by issuing the following command: apk add ip6tables ufw@testing. Basic configuration. The following is a simple configuration that will deny all incoming and outgoing data communication by default and allow incoming SSH, outgoing DNS and NTP traffic: Jun 10, 2020 · In this sense, Ubuntu comes with an application that facilitates the configuration of a Firewall. This is a UFW (Uncomplicated Firewall) that is presented as a front-end of Iptables. UFW commonly comes installed by default in Ubuntu 18.04. But it will most likely be disabled.