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ufw — Uncomplicated Firewall. Frontend for `iptables` aiming to make configuration of a firewall easier. M

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandfrontendforclifirewalliptablesuncomplicatedufw

linux

Problem

How to use the ufw command: Uncomplicated Firewall. Frontend for iptables aiming to make configuration of a firewall easier. More information: <https://wiki.ubuntu.com/UncomplicatedFirewall>.

Solution

ufw — Uncomplicated Firewall. Frontend for iptables aiming to make configuration of a firewall easier. More information: <https://wiki.ubuntu.com/UncomplicatedFirewall>.

Enable ufw:

sudo ufw enable

Disable ufw:

sudo ufw disable

Show ufw rules, along with their numbers:

sudo ufw status numbered

Allow incoming traffic on port 5432 on this host with a comment identifying the service:

sudo ufw allow 5432 comment "{{Service}}"

Allow only TCP traffic from 192.168.0.4 to any address on this host, on port 22:

sudo ufw allow proto tcp from 192.168.0.4 to any port 22

Deny traffic on port 80 on this host:

sudo ufw deny 80

Deny all UDP traffic to ports in range 8412:8500:

sudo ufw deny proto udp from any to any port 8412:8500

Delete a particular rule. The rule number can be retrieved from the ufw status numbered command:

sudo ufw delete {{rule_number}}

Code Snippets

Enable `ufw`

sudo ufw enable

Disable `ufw`

sudo ufw disable

Show `ufw` rules, along with their numbers

sudo ufw status numbered

Allow incoming traffic on port 5432 on this host with a comment identifying the service

sudo ufw allow 5432 comment "{{Service}}"

Allow only TCP traffic from 192.168.0.4 to any address on this host, on port 22

sudo ufw allow proto tcp from 192.168.0.4 to any port 22

Context

tldr-pages: linux/ufw

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