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Unable to get 2511 Access Server to reverse telnet

My test configuration is very simple. I have a 2511 connected to a 2621XM via an octal cable. I am directly connected to the console port of the 2511 and using leg 1 of the octal cable connected to the console port of the 2621. I have the following configuration in my 2511:

sh run

Building configuration...

Current configuration:

!

!

hostname termserver

!

interface Loopback0

ip address 172.21.1.1 255.0.0.0

!

ip host r1 2001 172.21.1.1

no ip classless

logging buffered

!

line con 0

transport input none

line 1 16

no exec

exec-timeout 0 0

transport input all

line aux 0

line vty 0 4

login

!

end

termserver#

This test configuration is essentially the exact configuration from the Cisco guide.

My target router (2621) has the following configuration:

sh run

Building configuration...

line con 0

password cisco

login

transport output all

line aux 0

line vty 0 4

no login

!

!

end

--More--

HQRouter#

When I attempt to make a reverse telnet connection to the test router, I get an indication that the connection is open, but I do not gain control of the remote device.

What follows is an example:

sh line

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

* 0 CTY - - - - - 11 0 0/0

1 TTY 9600/9600 - - - - - 8 0 0/0

2 TTY 9600/9600 - - - - - 0 0 0/0

termserver#

[Resuming connection 3 to r1 ... ]

[Connection to r1 closed by foreign host]

termserver#

[Resuming connection 9 to r1 ... ]

[Connection to r1 closed by foreign host]

termserver#sh session

% No connections open

termserver#sh line

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

* 0 CTY - - - - - 11 0 0/0

1 TTY 9600/9600 - - - - - 8 0 0/0

2 TTY 9600/9600 - - - - - 0 0 0/0

termserver#

termserver#

termserver#

termserver#r1

Trying r1 (172.21.1.1, 2001)... Open

Telnet1: 1 1 251 1

TCP1: Telnet sent WILL ECHO (1)

Telnet1: 2 2 251 3

TCP1: Telnet sent WILL SUPPRESS-GA (3)

Telnet1: 80000 80000 253 24

TCP1: Telnet sent DO TTY-TYPE (24)

Telnet1: 10000000 10000000 253 31

TCP1: Telnet sent DO WINDOW-SIZE (31)

Telnet0: Sent SB NAWS 0 0

TCP1: Telnet received DO ECHO (1)

TCP1: Telnet received DO SUPPRESS-GA (3)

TCP1: Telnet received WONT TTY-TYPE (24)

TCP1: Telnet sent DONT TTY-TYPE (24)

TCP1: Telnet received WILL WINDOW-SIZE (31)

Telnet1: recv SB NAWS 80 24

termserver#sh lin session

Conn Host Address Byte Idle Conn Name

* 1 r1 172.21.1.1 0 0 r1

termserver#

This capture shows that initially I had no open sessions and the lines were clear. I made an attempt to reverse telnet to r1. The connection was made but I was never presented with control of the remote device, regardless of the number of times I pressed enter. I had turned on debug telnet which produced the output. I regained control by executing ctrl-shift-6 x. Doing a show line indicates that I was connected to the remote device and the session is still open.

I have switched out the octal cable. I have tried another leg (which is another port) on the octal cable. I have even tried moving to the Async 9-16 port interface.

Jeff

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