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#1 2020-08-18 22:34:14

Registered: 2020-08-03
Posts: 865

It supports IPv4 and IPv6 versions of Ubuntu

Uncomplicated Firewall, abbreviated as UFW, is an easy-to-use and reliable firewall interface.
It supports IPv4 and IPv6 versions of Ubuntu.
This article will show you how to perform UFW firewall installation and how to configure advanced firewall rules in Ubuntu 20.04 Install UFW on Ubuntu 20.04 UFW is available on Ubuntu-based distributions, but in case you deleted it by mistake, you can install it again.
Follow the steps below to do so.
Step 1: Update APT As always, first, update your APT.

Do so by entering the following command: $ sudo apt update  Step 2: Upgrade APT Now

upgrade your APT.
To do so, enter the command below: $ sudo apt upgrade  Step 3: Download and Install UFW Enter the following command to download and install UFW onto your Ubuntu machine: $ sudo apt install ufw  You will be prompted with a yes/no condition.
Select “y” to continue the installation.
Step 4: Enable/Disable UFW You can enable/disable the UFW service every time the system boots up via the following command: $ sudo ufw enable  $ sudo ufw disable  Check the current status of UFW using the terminal command below: $ sudo ufw status  Step 5: Block Incoming and Allow Outgoing Data Traffic To block any incoming and allow outgoing data traffic.

Which is the default configuration in the UFW policy

enter one of the following two commands (the first is for outgoing, the second is for incoming): $ sudo ufw default allow outgoing Command: $ sudo ufw default deny incoming Step 6: Add, Modify, and Delete Firewall Rules You can add, modify, and delete firewall rules using two different methods, port number or service name.
Enter either of the following commands to do so: $ sudo ufw allow http  $ sudo ufw allow 80  Filter the data packets using different protocols.
$ sudo ufw allow 80/tcp  Step 7: Check Status of Updated Rules You can check the status of the updated rules with the terminal command given below: $ sudo ufw status verbose  Using Advanced UFW Rules You can allow a specific IP address to gain or deny access.
Execute the following command to allow the IP address to gain access to the services: $ sudo ufw allow from  $ sudo ufw deny from  Authorize an IP address to gain access to a TCP port using the terminal command given below: $ sudo ufw allow from to any port 80 proto tcp  You can specify ranges for a specific port.
To do so, execute the following command: $ sudo ufw allow 2000:3000/tcp  You can also deny a specific IP to gain access to a port while allowing other IP addresses to access that port.
To do so, enter the command given below: $ sudo ufw allow from to any port 22  $ sudo ufw deny from to any port 22  Allow specific protocol traffic on an ethernet interface by entering the following: $ sudo ufw allow in on etho0 to any port 80  UFW allows all ping requests; you can change this option using your favorite text editor in the configuration file.
$ sudo gedit /etc/ufw/before.rules Now, remove the lines given below: -A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT -A ufw-before-input -p icmp --icmp-type source-quench -j ACCEPT -A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT -A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT -A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT  Save this file and close it.
To reset all the rules in UFW, execute the following terminal command: $ sudo ufw reset  Conclusion That is all about UFW, using the UFW firewall rules, .

And using the UFW advanced firewall rules



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