How to block access to a computer to all ports except 1194?

Question

ubuntu

How to block access to a computer to all ports except 1194?

I don't understand much about this. if you can immediately either commands for the terminal, or the contents of rules.v4

I would be grateful!

Answer 1

close all incoming ports
iptables -P INPUT DROP
open port 1194 for all incoming connections
iptables -A INPUT --dport 1194 -j ACCEPT