Common UFW Firewall Rules and Commands

ufw [--dry-run] enable|disable|reload
ufw [--dry-run] default allow|deny|reject [incoming|outgoing]
ufw [--dry-run] logging on|off|LEVEL
    toggle logging. Logged packets use the LOG_KERN syslog facility. Systems configured for rsyslog
    support may also log to /var/log/ufw.log. Specifying a LEVEL turns logging on for the specified LEVEL.
    The default log level is 'low'.
ufw [--dry-run] reset
ufw [--dry-run] status [verbose|numbered]
ufw [--dry-run] show REPORT
ufw [--dry-run] [delete] [insert NUM] allow|deny|reject|limit [in|out] [log|log-all] PORT[/protocol]
ufw [--dry-run] [delete] [insert NUM] allow|deny|reject|limit [in|out on INTERFACE] [log|log-all]
    [proto protocol] [from ADDRESS [port PORT]] [to ADDRESS [port PORT]]
ufw [--dry-run] delete NUM
ufw [--dry-run] app list|info|default|update

Examples

ufw status verbose
ufw app list
ufw allow in on eth0 log from any to any app SSH-22022
ufw [delete] allow in proto udp from 193.204.114.105 to 12.34.56.78 port 123
ufw deny from 15.15.15.51
ufw deny in on eth0 from 15.15.15.51
ufw allow ssh
ufw allow 22
ufw allow from 15.15.15.0/24  to any port 22
ufw allow from 15.15.15.0/24 to any port 873
ufw allow proto tcp from any to any port 80,443
ufw allow from 15.15.15.0/24 to any port 3306
ufw allow in on eth1 to any port 3306
ufw deny out 25
ufw status numbered
ufw delete rule_number
ufw insert 1 your_rule