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Test remote port with and without telnet
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| # bash: It requires no other tools | |
| # cat < /dev/tcp/host/port or cat < /dev/udp/host/port | |
| $ cat < /dev/tcp/127.0.0.1/22 | |
| SSH-2.0-OpenSSH_5.3 | |
| # telnet: telnet host port | |
| $ telnet 127.0.0.1 22 | |
| # nc: nc -zv host port1 port2 or port3-port4 | |
| $ nc -zv 127.0.0.1 22 | |
| Connection to 127.0.0.1 22 port [tcp/ssh] succeeded! | |
| # curl: curl host:port | |
| $ curl localhost:22 | |
| SSH-2.0-OpenSSH_5.3 | |
| Protocol mismatch. |
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