UFW -- Uncomplicated Firewall
To turn on UFW,
sudo ufw allow 22
sudo ufw enable
sudo ufw status
sudo systemctl enable ufw
sudo systemctl start ufw
Adding exceptions
sudo ufw allow <port number or service name>
sudo ufw status numbered
sudo ufw reset
sudo ufw delete <number>
Specific Services
SSH
sudo ufw allow 22/tcp
# or
sudo ufw allow ssh
Samba
sudo ufw allow Samba
syncthing
sudo ufw allow syncthing
sudo ufw allow syncthing-gui
dnsmasq and dhclient
for enabling wifi bridging in ubuntu
sudo ufw allow to any port 53
sudo ufw allow to any port 67 proto udp
sudo ufw allow to any port 68 proto udp
Wireguard
sudo ufw allow 51820/udp
Unknown / Unused
sudo ufw allow 1701/tcp
sudo ufw allow 9901/tcp
sudo ufw allow 50000