Checking Connection without Telnet

Some of the minimal Linux distributions have no telnet client utility or similar utilities such as nc,ncat unless you install it. Most of time we need to do troubleshooting to check connection if  server/service is accessible. Do not worry–You still have mechanism inside the Linux kernel without installing above utilities. Take a look at below examples and change it accordingly for your case.

Checking TCP connection:

Checking UDP Connection: