Why and How to telnet without telnet?

  Why ?

Since most of security has not allowing to use a telnet tool as it is considered as a non-security tool , we have to find an alternative command to perform the testing of communication between host and client , “nc” will do this for us. Too many use case for it , here is just a simple use case.

How ?

Below are simple commands for using “nc” command

1- to test connection from client to host(server):

nc -zv <host> <port>

example:

nc -zv 10.1.100.10 1521

2- To check if server(host) is listening for specific port on the host itself :

nc -l -p 1521