firewall tutorial

digital ocean : https://www.digitalocean.com/community/tutorials/ufw-essentials-common-firewall-rules-and-commands

inspection

sudo ufw status

enable

sudo ufw enable

disable

sudo ufw disable

Block an IP Address

sudo ufw deny from 203.0.113.100

Delete a rule

sudo ufw delete allow from 203.0.113.101

list available application profiles

sudo ufw app list

enable application profile

sudo ufw allow "OpenSSH"

disable application profile

example :

sudo ufw delete allow 22/tcp