Is there a program that would make it easier to look at how network protocols work? [closed]

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I’m interested to know more about how certain network protocols work (like SSH or FTP for example). Is there a program that can facilitate connecting to computers on the network and communicating with them? I’d prefer a GUI program, and I’d prefer for it to work on OS X.

For example, I use a program that allows me to test REST services. I can use it to send requests in the HTTP method of my choice, and analyze the response.

Of course, this program is made for HTTP requests. I’m looking for a much more general way to look at protocols.


Wireshark will show you the protocol (but not let you enter data).

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