Enable UFW (Uncomplicated Firewall) on Ubuntu

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The default firewall configuration tool for Ubuntu is ufw (Uncomplicated Firewall). Developed to easeiptables firewall configuration,ufw provides a user friendly way to create an IPv4 or IPv6 host-based firewall. By default UFW is disabled.

Step 1: Enabling / Disabling ufw
To enable it, you just need to type the following command at the terminal.
# sudo ufw enable

Firewall is active and enabled on system startup

To disable it, just type.
# sudo ufw disable

Step 2: List the current ufw rules
After the firewall is activated you can add your rules into it. If you want to see what are the default rules, you can type.

# sudo ufw status verbose

sample output:

       Status: active
       Logging: on (low)
       Default: deny (incoming), allow (outgoing)
       New profiles: skip

Step 3: Adding specific rules to ufw
You can specify or add the port range which you want to setup with ufw.
# sudo ufw allow <port>/<optional: protocol>

Example: To allow incoming tcp and udp packet on port 53
# sudo ufw allow 53

Example: To allow incoming tcp packets on port 53
# sudo ufw allow 53/tcp

Example: To allow incoming udp packets on port 53
# sudo ufw allow 53/udp

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