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How to use nc as substitute for telnet to do connectivity test to remote IP and port

1. simplest form nc <ip> <port> 2. verbose nc -v <ip> <port> 3. verbose and fixed timeout nc -v -w1 <ip> <port> 4. put up a listening port on all IP and specific port on this machine nc -l <port> 5. put up a listening port on specific IP addr and port on this machine nc -l <localip> <port>