Can someone pls explain to me what is the purpose of port numbers 2000, 3000, 4000? For example, I know if I use port 2097 (2000 + 97) using the example below, I can do a reverse telnet with serial3/0 interface. Are the port numbers (2000/3000/4000) user definable? When should I use 2000 or 3000 or 4000? Thank you.
# telnet a.b.c.d 2097
interface Serial3/0 physical-layer async description Connected to TNT GHU no ip address encapsulation slip
line 97 modem InOut no activation-character transport preferred telnet transport input telnet transport output telnet stopbits 1 speed 2400
Cisco#sh line Tty Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int 0 CTY - - - - - 0 0 0/0 - 97 TTY 2400/2400 - inout - - - 52 3 0/0 Se3/0
Re: Cisco router built-in TCP port number for telnet
I found an example of port 4321 used for Stream TCP (see below). Is the port number range 4000 meant for Stream TCP?
Stream TCP Autocommand Procedure
In the following procedure, a line is configured so that any connection into it is automatically connected using Stream TCP to the application server at the specified IP address and TCP port (IP address 10.1.2.3 and TCP port 4321 in the examples).
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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