Port scanning my machine

[pcm81]

I have a Raspberry Pi running at home. The Pi is behind a network router, WAN port of which is connected to cable modem.

I have my SSH port forwarded from the router to Raspberry Pi (SSH server is not running on router, just the PI). I can successfully SSH into raspberry pi, I can create SSH tunnel and even run VNC from my cellphone or laptop which are on holels wifi network 1000 miles away from home.

The interesting thing is: if I try to portscan my home's outside IP from a cellphone (tried hotels wifi and 3g), I see port 53 open on my home IP, but I do not see any other ports open. I am scanning ports 1-100 and the SSH port is in that range and is not #53. What is going on there? Why does my port scan not show my open ssh port on the router?

Just trying to learn, so don't be afraid to hit me with information overload.

Thanks

 

[mxnerd]

Try a different scanner. Some scanner scans too fast and the machine being scanned does not have enough time to respond and the scanner will think the port is closed.

port 53 is usually for DNS, check again if it's open.

 

[pcm81]

Try a different scanner. Some scanner scans too fast and the machine being scanned does not have enough time to respond and the scanner will think the port is closed.

port 53 is usually for DNS, check again if it's open.

You hit the nail on the head. Needed a scanner with bigger timeout. Now I see the open ports.

 

[JackMDS]

You can go Here - https://www.grc.com/shieldsup

Click Proceed and in the next page center under ShieldsUP!! Services you have choices in what to scan including All ports.

 

[pcm81]

You can go Here - https://www.grc.com/shieldsup

Click Proceed and in the next page center under ShieldsUP!! Services you have choices in what to scan including All ports.

Awesome tool. Thanks.

 

[CubanlB]

nmap or Zenmap if you want to do the enumeration your self and have more control over every aspect of the scan.

https://www.linux.com/learn/tutorials/290879-beginners-guide-to-nmap