Series 3: Out-of-Band Management

Beverly McRae

Series 3: Out-of-Band Management

Products Supported: AER2100, MBR1400v2, MBR1400v1, IBR11x0, IBR6x0, CBA850, CBA750B. Click here to identify your router.

Firmware Version: 5.3.4 – for information on upgrading firmware, click here.


This document is intended to guide an administrator through configuring the Serial Redirector feature on Cradlepoint routers for out-of-band management and troubleshooting of devices with an RS232 console interface. Once turned on, this feature is used by establishing a telnet client session with the router, which then redirects the telnet traffic to the attached console cable.


Configuration Difficulty: Intermediate

Physical Setup

  1. Obtain the necessary equipment.
    • IBR11x0: When initiating serial redirect from this router model, a DB9 Male to Male serial adapter is required. An example is located here. This product is not sold by Cradlepoint.
    • All other Cradlepoint models: A USB-to-serial adapter that uses an FTDI chip set such is required to use the Serial Redirect feature. For more information on finding the right kind of adapter, consult the guide located here.
    • Optional: 1-to-4 USB to RS232 serial adapter for support of multiple out of band devices.
  2. Make all the appropriate physical connections before beginning the configuration.

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For example:

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Software Setup

  • Step 1: Log into the router’s Setup Page. For help with logging in please click here.
  • Step 2: Click on System Settings and select Serial Redirector from the drop-down menu.

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  • Step 3: Place a check mark next to Enabled. Wait for Server Status to become “Ready“.
    • Note: The Server Status will read Starting and never change if there is a problem with the detection of the adapter. This usually means the adapter is not supported by the router.
  • Step 4: In the USB Serial Adapter Configuration section, set the values to match those used by your device.
    • NOTE: Some routers require slightly different settings than Cradlepoint’s defaults. If you find that the console window does not appear to be displaying the data correctly (such as inserting a blank row between each line of text), try changing the Cradlepoint’s “Line Feed” option to a different value and then try again.
  • Step 5: Click Apply.

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Direct Connection

NOTE: Cradlepoint highly recommends using the SSH-to-Serial access option instead because it is encrypted and requires a username and password. We recommend NOT using telnet-to-serial access unless the device is on a private network and not accessible from the Internet.

Using your system’s telnet client software, establish a session to the Cradlepoint.

The example below shows a local connection through PuTTY.

  • Specify the Cradlepoint’s LAN or WAN IP address.
    • (Note: the WAN connection will not work unless WAN is enabled within the router’s System Settings>Serial Redirect>Telnet to Serial Configuration section. This option is highly insecure and should not be used unless the Cradlepoint router is on a private network and not accessible from the Internet.)
  • Specify the telnet port specified on the router’s System Settings>Serial Redirect>Telnet to Serial Configuration page.

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Once the session is established, you may interact directly with your hardware.

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Secure Connection

An alternate, and secure, way to access your hardware would be to establish a SSH session to the Cradlepoint. This can be done in one of three ways:

(Click each option to open up the corresponding walkthrough guide.)

Once you have access to the router’s CLI, you can issue the serial command to create a console session to your hardware.

Use the following command to initiate the serial redirect:


If you are using a 1-to-4 USB to Serial Adapter, utilize the following command to initiate a serial connection to a specific client device:

serial # – for example – serial 3

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After the session is established, you will be able to access the console of your device.

Use the following commands to end the session:

CTRL + W to break connection to the device, but keep the SSH session up

CTRL + Q to break connection to the device and end the SSH session

NOTE: Only one session can be active at the a time. If a new session is opened (if the device is accessed by a different method, or by a second user) before the original one is stopped, you may receive garbled feedback.


  • Reboot the hardware, including the Cradlepoint router and its client serial device.
  • Reseat the connectors.
  • Disable/re-enable the Serial Redirect feature on the Cradlepoint router.
  • Ensure you are able to access your device’s console directly through the USB-to-Serial adapter.
  • Check the RS232 settings on your device and make sure they match.
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