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Webcast-Catalyst9k
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One-way reverse telnet traffic using 1841 WIC-2T

I have configured a serial interface on a WIC-2T on 1841 IOS 12.4(15)T5 for reverse telnet (9600 8-N-1) and connected a terminal to the interface.

(a) characters typed in a router telnet session (telnet 10.132.210.22 2002) correctly appear on the terminal screen.

(b) however characters typed on the terminal keyboard do NOT appear on the router telnet session. I know that the characters are transmitted on the line correctly (shown by line monitor).

The same problem does not occur when using the AUX port on the same router (telnet 10.132.210.22 2001) with essentially identical configuration:

interface Serial0/0/0

physical-layer async

no ip address

encapsulation slip

line aux 0

exec-timeout 15 0

modem InOut

no exec

transport input all

transport output all

line 0/0/0

exec-timeout 0 0

modem InOut

no exec

transport input all

transport output all

stopbits 1

#sh line

   Tty Line Typ     Tx/Rx    A Modem  Roty AccO AccI  Uses  Noise Overruns  Int

      0    0 CTY              -    -      -    -    -     0      0    0/0      -

      1    1 AUX   9600/9600  - inout     -    -    -     1      0    0/0      -

  0/0/0    2 TTY   9600/9600  - inout     -    -    -     1      0    0/0    Se0/0/0

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