Ubuntu Firewall

Ubuntu includes ufw (uncomplicated firewall) by default, but it is not enabled.

Configure by command line

Install UFW

sudo su
apt-get install ufw

SSH

ufw allow ssh

HTTP/HTTPS - FusionPBX

ufw allow 80/tcp
ufw allow 443/tcp

SIP and RTP - FreeSWITCH

ufw allow proto tcp from any to any port 5060:5069
ufw allow proto udp from any to any port 5060:5069
ufw allow 5080
ufw allow 5081
ufw allow proto udp from any to any port 16383:32768

Enable UFW

ufw default deny
ufw enable
ufw logging on

Blacklist

Blacklist the IP address

ufw insert 1 deny from x.x.x.x

Remove the blacklisted IP address

ufw delete allow x.x.x.x

(Replace x.x.x.x with the IP Address in the following commands.)

Optional

OpenVPN

ufw allow 1194/udp
ufw allow 1194/tcp

H323

ufw allow 1719/udp
ufw allow 1720/tcp

STUN

ufw allow 3478/udp
ufw allow 3479/udp

MLP protocol server

ufw allow 5002/tcp

Neighborhood service

ufw allow 5003/udp

Additional Commands

ufw status
ufw delete 3

More Information

https://help.ubuntu.com/10.04/serverguide/C/firewall.html

http://pka.engr.ccny.cuny.edu/~jmao/node/28

https://help.ubuntu.com/community/UFW

man ufw