====== General ======
===== Installing =====
ufw should be installed by default on newer Ubuntu servers. (Although it is most likely disabled)

===== Enabling =====
<code bash> 
sudo ufw default allow  # Careful, uwf by default DENIES all incoming traffic. So I first set it to "allow" here to avoid being locked out of the server
sudo ufw enable  
</code>

===== Checking status =====
<code bash>
sudo ufw status verbose
</code>


====== Adding Rules ======
===== Block an IP =====
<code bash>
sudo ufw deny from 10.101.21.228
</code>

===== Block a Port =====
<code bash>
sudo ufw deny 53
</code>

====== Removing Rules ======
<code bash>
sudo ufw delete deny from 10.101.21.228
</code>


====== External Links ======
  * https://help.ubuntu.com/community/UFW
  * http://1000umbrellas.com/2010/04/29/how-to-set-up-the-firewall-using-ufw-on-ubuntu-lucid-lynx-server
  * https://help.ubuntu.com/8.04/serverguide/C/firewall.html