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NCOS: WAN Verify

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NCOS: WAN Verify

 

Products Supported: IBR350, IBR6x0, IBR11x0, AER2100, AER31x0, MBR1400, MBR1200B, CBA750B, CBA850. Click here to identify your router.

NCOS Version: 6.0.x - 6.5.0 - for information on upgrading NCOS Versions, click here.


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Summary

Configuration

Troubleshooting

Related Articles


Summary

This article describes how to configure WAN Verify on a Series 3 Cradlepoint router. This is the feature formally known as Advanced Failure Check.

WAN Verify lets the router to actively verify the status of its WAN interfaces, which leads to a quicker resolution of a problem if one is found.


Configuration

Configuration Difficulty: Beginner
  • Step 1: Log into the Cradlepoint's NCOS Page. For help with logging in please click here.
  • Step 2: Click on Connection Manager from the navigation menu.
  • Step 3: Click on the User-added image icon under the WAN Verify column User-added image for the appropriate Profile or Interface to go directly to it's WAN Verification settings.

          User-added image

  • Step 4: Set the desired Check Interval. This determines how often the router verifies that a connection is valid on this interface. A lower value will lead to quicker detection of a potential problem, but will also use up more of the router's resources and result in higher data usage.
  • Step 5: Click the down arrow next to the Monitor while connected field to select the desired failure check method.
    • Note: For cellular modems, the recommended failure check option is Passive DNS.
    • Note: If Active Ping is used as the failure check method, the destination IP address MUST be a stable address on the internet. Recommended option is 8.8.8.8.
  • Step 6: Set the Retry Interval and Retry Count. These values determine how many packets the router sends to test the connection, and how long it waits between each packet, in a given Failure Check occurrence.
    • Higher numbers will increase the time it takes for the router to confirm the connection is down. Lower numbers might end up with false positives, leading the router to believe the interface is down even though it lost only a couple of packets because of a temporary blip.

          User-added image

  • Step 7: Click Save to apply the changes. The User-added image icon turns green indicating WAN Verify is enabled on that Profile and Interface.
    • NOTE: the modem may briefly disappear from the WAN Interfaces list while it loads the new settings.

         User-added image

  • Step 8: For NCOS versions 6.0 and above Aggressive Modem Reset is on by default and cannot be disabled.  For NCOS versions prior to 6.0, verify that Aggressive Modem Reset is enabled. Reference this article for more information.

Troubleshooting

Interface Disconnects

If your modem starts disconnecting after WAN Verify is enabled, but you know the actual modem has an internet connection, please verify your settings.

Active Ping

  • If the ping destination IP address is unreachable, the router will think there is no internet connection. Make sure the destination IP is a valid address on the internet with guaranteed uptime.
  • Many cellular providers will see a constant stream of pings as unwanted traffic, and they will block the connection that is generating them. Try instead using Active DNS or Passive DNS as the failure check methods.

Long Check Interval

  • If the failure check interval is very long, the router might disconnect because it has to wait a very long time (number of seconds equaling [failure check interval] times [retry count] times [retry interval]) to confirm that an interface is up. If there is even one packet lost, it has to start over.

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Published Date: 07/14/2017

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