Dahua NVR Dual ethernet not workable

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Dec 13, 2019
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Hi

I am using several dahua NVRs for my cctv system. But dual ethernet setting with two lan cable cause NVRs offline or only have recording occasionally. I have to remove 1 LAN to resume normal.
The NVR is in fault tolerance mode. If I choose Load balance mode, the NVRs are normal but I need fault tolerance mode.

I am very confused about this problem. Thanks
 
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