User Manual of 89XX-R Series NVR
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Net-fault Tolerance Mode: The two NIC cards use the same IP address, and you can select the Main NIC to LAN1
or LAN2. By this way, in case of one NIC card failure, the device will automatically enable the other standby NIC
card so as to ensure the normal running of the whole system.
Figure 11. 2 Net Fault-tolerance Working Mode