tldr/pages/linux/ufw.md

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# ufw
> Uncomplicated Firewall.
> Frontend for iptables aiming to make configuration of a firewall easier.
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> More information: <https://wiki.ubuntu.com/UncomplicatedFirewall>.
- Enable ufw:
`ufw enable`
- Disable ufw:
`ufw disable`
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- Show ufw rules, along with their numbers:
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`ufw status numbered`
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- Allow incoming traffic on port 5432 on this host with a comment identifying the service:
`ufw allow {{5432}} comment "{{Service}}"`
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- Allow only TCP traffic from 192.168.0.4 to any address on this host, on port 22:
`ufw allow proto {{tcp}} from {{192.168.0.4}} to {{any}} port {{22}}`
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- Deny traffic on port 80 on this host:
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`ufw deny {{80}}`
- Deny all UDP traffic to port 22:
`ufw deny proto {{udp}} from {{any}} to {{any}} port {{22}}`
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- Delete a particular rule. The rule number can be retrieved from the `ufw status numbered` command:
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`ufw delete {{rule_number}}`