How to create port listener on Linux

Install nc if needed

yum install nc

Run listener on port 3000

nc -l 3000 &
nc -l -k 3000 &

where -k is –keep-open will keep connection opened and allows multiple connections in listen mode

Check on the server’s side:

netstat -tunap |grep :3000

Output:

tcp        0      0 0.0.0.0:3000                0.0.0.0:*                   LISTEN      82786/nc            

Check from local machine:

$ nmap -p 3000 SERVERS_IP_ADDRESS

Output:

Starting Nmap 7.01 ( https://nmap.org ) at 2018-01-15 18:46 EET
Nmap scan report for my-cloud-host.net
Host is up (0.14s latency).
PORT     STATE SERVICE
3000/tcp open  ppp

Nmap done: 1 IP address (1 host up) scanned in 0.36 seconds

Remove listener:

fg

Ctrl + C

Done!

 

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