# XR80 Interface Validation

**URL:** <https://forum.sierrawireless.com/t/xr80-interface-validation/32952>\
**Category:** AirLink routers\
**Created:** [September 9, 2024, 8:41pm UTC](https://forum.sierrawireless.com/t/xr80-interface-validation/32952 "2024-09-09T20:41:21Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![swnelson](https://avatars.discourse-cdn.com/v4/letter/s/9f8e36/32.png) [@swnelson](https://forum.sierrawireless.com/u/swnelson)\
**Post date:** [September 9, 2024, 8:41pm UTC](https://forum.sierrawireless.com/t/xr80-interface-validation/32952/1 "2024-09-09T20:41:21Z")

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Having a problem, its come up a few times now. Carrier A has an internal network problem, the XR unit is connected to it, signal strength is great, but you can’t get to anything. Carrier B is also connected, it is fully functional, I can get to resources I need. Why does it not fail over to Carrier B? Why is Carrier A still “validated” when it can’t get to anything.  
I’m trying to understand the validation of the interface.  
If you look at the Multi-wan link here, [Configuring Multi-WAN Policies - XR80-4.0 - Sierra Wireless](https://source.sierrawireless.com/airlinkos/XR80-4.0/reference/networking/howto/multiwan/)  
you can see the last step is validated, but what is the validation process? Can I edit it? To me it looks like its bugged and just doesn’t work, there is no validation going on.

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**Author:** ![jerdung](https://avatars.discourse-cdn.com/v4/letter/j/82dd89/32.png) [@jerdung](https://forum.sierrawireless.com/u/jerdung)\
**Post date:** [September 11, 2024, 11:00am UTC](https://forum.sierrawireless.com/t/xr80-interface-validation/32952/2 "2024-09-11T11:00:23Z")

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Hi @swnelson,

Please answer the questions below to investigate this issue:

1. What is your XR80 using AirLink OS?
2. According to the description, I understand that you use two SIM cards. 1 SIM from carrier A and 1 SIM from carrier B. Do you want to automatically switch to carrier B when carrier A has an issue? If not, please clearly describe.
3. Please send me the screenshot when you configure Multi-WAN Policies (Policy Route Management, Roaming Policies, Signal Policies, Wi-Fi SSID Policies, Speed Policies) to investigate this issue.

Thanks,

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**Author:** ![azmat.consult](https://avatars.discourse-cdn.com/v4/letter/a/8797f3/32.png) [@azmat.consult](https://forum.sierrawireless.com/u/azmat.consult)\
**Post date:** [September 16, 2024, 11:19am UTC](https://forum.sierrawireless.com/t/xr80-interface-validation/32952/3 "2024-09-16T11:19:01Z")

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Can you try these solutions

- **Adjust Validation Settings** : Check the XR80’s configuration for WAN validation. Enable more comprehensive checks like:
- **Ping Test** : Set it to ping a known external IP (e.g., `8.8.8.8`).
- **DNS Check** : Add a DNS resolution test to ensure network reachability.
- **Failover Policy** : Make sure the failover settings use these enhanced checks, not just link status, to determine when to switch carriers.
- **Firmware Update** : Ensure the XR80 is running the latest firmware, as this might be a bug in the current version.

I hope this will help you…[.](https://aaroniz.com/)…