Re: SLIP/PPP question (NOT the usual)

[nparker@cie-2.uoregon.edu (Neil Parker)]

In article <5hv55l$370$2@news.vanderbilt.edu>
NOleshSPAMerjtHERE@vuse.vanderbilt.edu (Tilghman Lesher) writes:
>: Dave Althoff <dalloff@freenet.columbus.oh.us> wrote:
>: : Something tells me that Telnet and FTP are probably similar.
>: : So what is the problem?
>
>FTP is just a Telnet to port 21, instead of port 23. 

Ahh, would that it were that simple.

Telnetting to port 21 just gives you the *command* interface to FTP.
Actually transferring files (including getting a directory listing)
requires a second simultaneous connection.

There's also the fact that when a true (port 25) telnet connection first
starts up, the client and the server exchange a series of special control
codes so that each can determine which features the other is willing to
support.  This feature negotiation doesn't occur for connections to ports
other than 25 (because whatever's on the other end of the connection
probably won't know what to do with the telnet negotiation codes).

When it comes right down to it, the only thing telnet and FTP have in
common is that they're both built on top of the TCP protocol.

               - Neil Parker
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