Rather than saying ports are open I would rephrase it as "ports are not blocked". On excitel's public IP only two services are running which are ssh (22), BGP(179) [as told to me by nmap]. Therefore if you type publicIP : Port in any application you can only connect to these two ports. I am doing some more tests.Is there any way I can know which ports are allowed by the Excitel?
I want to use some ports for my applications.
Are you trying to say, they don't have any ports open?
So just to make sure. I used a small Linux machine which I had and added that to DMZ. Still, I can't connect to it using the public IP which I have.