ufwコマンド

$ sudo ufw allow from 192.168.0.0/24 to any port 22 proto tcp

$ sudo ufw allow to any port 80 proto tcp

$ sudo ufw deny to any port 8080 proto tcp

$ sudo ufw status numbered 
Status: active

     To                         Action      From
     --                         ------      ----            
[ 1] 22/tcp                     ALLOW IN    192.168.0.0/24          
[ 2] 80/tcp                     ALLOW IN    Anywhere
[ 3] 443/udp                    ALLOW IN    Anywhere

$ sudo ufw delete 1

$ sudo ufw reload

IPV6=yes
↓
IPV6=no

ufw再起動

$ sudo systemctl restart ufw