ISR 1100 reverse telnet (continue)

[k-baba]

I want to use C1111-4P as terminal server for other router's console port.

I found past discussion in below, and I tried to make it, but not successful. (attached is current config)

https://community.cisco.com/t5/other-network-architecture-subjects/isr-1100-reverse-telnet/td-p/4184618 

Is it possible to use C1111-4P as terminal server.

If someone has successful config, please share it

Best Regards,

[balaji.bandi]

I used different routers long back below simple configuration works for me : (make sure speed should match both the sides)

line con 0
speed 115200
exec-timeout 0 0
transport input all
flow-control hardware

telnet x.x.x.x 2000  (show line show your CTY 0)

[k-baba]

Hello BB,

unfortunately, it did not work here.

Following is "show line",  config of line and result of telnet. 10.10.10.10 is loopback IP address.

Router#sh line
Tty Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int
0 CTY - inout - - - 0 1 0/0 -
* 1 VTY - - - - - 3 0 0/0 -
2 VTY - - - - - 0 0 0/0 -
3 VTY - - - - - 0 0 0/0 -
4 VTY - - - - - 0 0 0/0 -
5 VTY - - - - - 0 0 0/0 -
6 VTY - - - - - 0 0 0/0 -
7 VTY - - - - - 0 0 0/0 -
8 VTY - - - - - 0 0 0/0 -
9 VTY - - - - - 0 0 0/0 -
10 VTY - - - - - 0 0 0/0 -
11 VTY - - - - - 0 0 0/0 -
12 VTY - - - - - 0 0 0/0 -
13 VTY - - - - - 0 0 0/0 -
14 VTY - - - - - 0 0 0/0 -
15 VTY - - - - - 0 0 0/0 -

Line(s) not in async mode -or- with no hardware support:
16-879

Router#sh run | s line
line con 0
exec-timeout 0 0
modem InOut
no exec
transport input all
transport output all
stopbits 1
flowcontrol hardware
line vty 0 4
exec-timeout 120 0
password cisco
login
transport input telnet ssh
line vty 5 14
login
transport input ssh
Router#telnet 10.10.10.10 2000
Trying 10.10.10.10, 2000 ...
% Connection refused by remote host

I also tried "transport-map" and "transport type console" , but it did not work.

[pieterh]

>>> Router#telnet 10.10.10.10 2000 <<< -> try 2001
although line number = 0, you may need to add one to the base address 
what shows up in the logging of the router?

[k-baba]

Port 2001 does not work either.

Router#telnet 10.10.10.10 2001
Trying 10.10.10.10, 2001 ...
% Connection refused by remote host

I think 2001 is allocated to TTY 1, but it is VTY 0, not serial like AUX 0

There is no logging while making connection tests by telnet. If some debug should be enabled, please advise.

[pieterh]

Router# debug telnet

(on the target-switch) command should be present long time

if you started your telnet session from another switch you can try "telnet /debug"
Command Reference (cisco.com)

[k-baba]

After enabling "debug telnet", I can see debug log when I make normal telnet (port 23), but cannot see any log by telnet with port 2000 or 2001.

I guess telnet process on router is not listening incoming connection with port other than 23

[pieterh]

just to be certain: you've checked there are no other firewalls/ACL's in the path to this router that block port 2000/2001?

[k-baba]

I am executing telnet for those ports at router itself to loopback IP.

There is no firewall or acl for telnet connection.

[k-baba]

I opened TAC case and waiting for response now.