ufw - Ucomplicated Firewall

I'm starting to play around with ufw (Ucomplicated Firewall), a firewall for Linux.

It's command line based, but simple enough.

I'll update this post as I play along.

Enable/disable ufw

• enable

sudo ufw enable

• disable

sudo ufw disable

Default policy

• mostly open ports

sudo ufw default allow

• mostly closed ports

sudo ufw default deny

Add rules syntax

sudo ufw allow|deny [proto *protocol*] [from *address* [port *port*]] [to *address* [port *port*]]

Delete rules syntax

sudo ufw delete *rule type* from *ip address* to any port *port number*

Firewall status

sudo ufw status

Firewall loaded

To                         Action  From
--                         ------  ----
24800:tcp                  ALLOW   100.000.1.1

Examples

sudo ufw allow proto tcp from 100.000.1.1 to any port 24800
sudo ufw delete allow proto tcp from 100.000.1.1 to any port 24800

Further reading

• Ubuntu Wiki
  
• Ubuntu Forums

last updated: 10-06-2008