From: The IBM z/VM Operating System on behalf of Tom Duerbusch
Sent: Wed 5/17/2006 10:54 AM
To: [email protected]
Subject: [IBMVM] Dumb IP question
From my understanding, when a client connected to the server
stack at a
particular port, that port is tied up and no one else can connect
to
it.
If I remember correctly, when you FTP to port 21, the FTP
server
responses with another port that you should use for the rest of the
FTP
session. This keeps port 21 from being tied up during long
FTP
sessions. Right?
OK, how does this concept work with Telnet,
port 23? Is my client
being transferred to other ports? Are all
of my hundreds of telnet
sessions, all using the same port 23? Are they
using it "one at a
time"? When I hit enter, and it takes 5-10 seconds
to get a response,
is my client tieing up the port so no one else can use
it? All of that,
just doesn't sound right. Is there a concept of
"shared ports"?
Just how it short tasks like telnet (tn3270), and I
guess, webservers
(port 80), handle this? Where is the documentation
that may explain how
things are done, for what
service?
Thanks
Tom Duerbusch
THD
Consulting
