I was in a discussion with someone this weekend regarding terminal
server configuration and the following issue came up.  CCO states that
on the terminal server, at the very least "transport input telnet" needs
to be configured, if not "transport input all".  Why is this?

With a terminal server, we are connecting to a console port that has no
concept of IP or telnet.  You connect to the console port using async
serial terminal protocols, *not* telnet.  Sure, it may be called Reverse
Telnet, but the telnet protocol is not end-to-end; it stops at the
terminal server.  From the terminal server to the device it is connected
to you are simply using async serial.  So, why do we need transport
input telnet??

We did verify that without this command it will not work.  Also, why
would the ALL keyword work?  As far as I can see, none of the available
protocols make any sense in this context.  

Just curious.  Perhaps I'm suffering from a brain cloud today.  :-)

John




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