Ufw

Uncomplicated FireWall

Default Policies

sudo ufw default deny incoming sudo ufw default allow outgoing

Allow a Specific Port

sudo ufw allow 2222/tcp sudo ufw allow https

Allow a Specific Port from Specific IP

sudo ufw allow from 10.10.10.2 to any port 2222

Allow a Specific IP on all Ports

sudo ufw allow from 10.10.10.3

Deny Connections

sudo ufw deny from 10.10.10.0/24

Delete Rules

sudo ufw status numbered sudo ufw delete 3

Miscellaneous

sudo ufw status sudo ufw enable sudo ufw disable sudo ufw reset

Resources

https://doc.ubuntu-fr.org/ufw https://www.digitalocean.com/community/tutorials/ufw-essentials-common-firewall-rules-and-commands-fr