01-29-2014 11:54 PM - edited 03-07-2019 05:54 PM
Current setup
==========
I have two serial devices utilising RS232 Rxd/Txd (no control signals) connections over two serial ports on an old IBM terminal server to a specialised server on the IP network:
Remote display -----RS232----- IBM terminal server (serial port 1) +++
| ++++++IP++++++ Server
Remote sensor -----RS232----- IBM terminal server (serial port 2) +++
The first connection passes messages from a server via the IBM terminal server to a remote display.
The second connection passes a telnet session from the remote device to a server on the network
TELNET -eQ -f 123.4.5.6 2008
.......message........
Q
New setup
========
Replaced the IBM terminal server with a Cisco 2901 ISR with two of its serial ports (8 and 9) configured the same as the existing IBM serial port
interface Async0/0/8
description
no ip address
ip nat inside
ip virtual-reassembly in
encapsulation slip
!
interface Async0/0/9
description
no ip address
ip nat inside
ip virtual-reassembly in
encapsulation slip
!
line 0/0/0 0/0/15
terminal-type ansi
no exec
transport input all
transport output all
The first connection passes messages from a server via the 2901 ISR to a remote display.
The telnet session from the remote device does not "arrive" on the server (note the Noise count on this port)
#sh line
Tty Line Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int
0/0/8 11 TTY 9600/9600 - - - - - 19 0 0/0 -
0/0/9 12 TTY 9600/9600 - - - - - 0 8 0/0 -
Any assistance to fault find/resolve is greatly appreciated
01-30-2014 08:10 AM
I am certainly not authoritative on this. But I wonder if the no exec configured on Async0/0/9 might be the issue. What happens if you enable exec on that line?
HTH
Rick
01-31-2014 02:57 AM
Hi Rick,
I need to organise site access to follow this suggestion up.
Researching this option I have found the following:
On the configuration of the HWIC lines, use the no exec command. The reason is that if any message is sent from the attached devices to the HWIC card (such as logging message) while there is no session running on that port, the router with the HWIC card will start an EXEC session for that port, thereby disabling the option to reverse telnet to that port.
Thanks,
Terry
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