ufw - Uncomplicated Firewall

I used ufw for the frist time today to block some IP addresses that kept posting spam messages to my blog or attacking SSH with known usernames.

It’s a simple interface to the powerful iptables package and really easy to use.  I installed on Ubuntu Server using:

apt-get install ufw

Deny everything by default:

ufw default deny

Block the offending IP addresses:

ufw deny from 194.8.74.0/23
ufw deny from 94.229.65.173
ufw deny from 69.162.73.178
ufw deny from 218.237.55.219
ufw deny from 211.192.64.203
ufw deny from 218.249.60.87
ufw deny from 64.183.108.76

Let my services through:

ufw allow http
ufw allow ssh
ufw allow smtp
ufw allow imap

Enable ufw:

ufw enable

Bingo! No more spam.  No more username attacks in my auth.log.