ufw
ufw, or uncomplicated firewall, is a command-line application that ships with Ubuntu to setup iptables.
Once you enable ufw with ufw enable, it will add the firewall to the startup services.
Examples
ufw allow proto tcp to any port 22 ufw allow proto tcp to any port 80 ufw allow proto tcp to any port 222 ufw allow proto tcp to any port 443 ufw allow proto tcp to any port 10000 ufw enable
Allow connections from local subnet, and specific outside IP address:
ufw allow from 192.168.12.0/24 ufw allow from 1.2.3.4
Start firewall
ufw enable #interactive yes y | ufw enable # batch
Show firewall status
ufw status
Stop firewall
ufw disable
Display existing rules:
ufw status numbered
Delete existing rule:
ufw delete <rule number>
Save iptables rules
iptables-save > foo
