Use the Serial Port Forwarding feature to make the console port of the managed device available on a local workstation via reverse SSH tunnel. In order to utilize this feature, a user must have the terminal privilege.
An SSH client with reverse tunnel capabilities is required to use this feature. Supported clients include PuTTY and the SSH Applet on the Control Center.
Prior to setting up serial port forwarding, initialize the Local Manager port with the appropriate device driver via the config init command.
The following is an example using PuTTY, for an example using the SSH Applet in the Control Center, refer to Serial Port Forwarding in the Control Center User Guide.
To set up serial port forwarding using PuTTY:
Open PuTTY to display the configuration window. Enter the IP address of the Lantronix device (1). Under Category on the left, expand the SSH group and select Tunnels (2).
For Source Port, enter the local TCP port to forward the console connection to (1). This port should not be in use on your computer.
Windows typically reserves ports 1023 and below. Choose a TCP port number above this range.
For Destination, enter serialportX_Y:Z where X is the slot number, Y is the port number, and Z is an arbitrary port number (2).
Leave all other options as default and click Add (3).
Be sure to use serialportX_Y and NOT portX_Y, which is used for SSH Port Forwarding.
Click Open to begin the SSH session. Enter your username/password and navigate to the port you wish to forward. Use the terminal forward command to begin a forwarded session.
[admin@LantronixLM]# port 1/4 DAL-CORE cisco 7604 IOS 12.2 [admin@u3200 (port1/4)]# terminal forward Press ~[ENTER] to exit Connecting ... Retrieving running-config from device ... Complete. running-config pulled. running-config saved to archive as current. Console session forwarded. DAL-CORE#
The console port of the managed device is now available locally. Telnet to 127.0.0.1 (localhost) on the Source TCP port specified.
If you select Telnet as the Connection type AFTER entering the port number, PuTTY may change the port back to 23. Be sure to change it to the Source TCP port specified earlier before clicking Open.
Anything typed in the telnet session will be visible on the original SSH session.