[humanpuff69]

Ip tables is great firewall that is jncluded in almost any linux distro . The only problem that i have is that it isnt persistent but luckily it is solved by just installing iptables persistent package

Also if you want just to block specific port ufw is a better solution . It is easier to use but it isnt as complex as iptables . Ufw only allow to block port but that is what most people use firewall for