QNAP VioStor CMS, User Manual

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Configuring NVR with Dual LAN Ports
If the NVR supports two LAN ports, select to use failover, load balancing, or standalone
setting. To use these features, make sure both LAN ports are connected to the network.

Failover (Default settings for dual LAN NVR models): Failover refers to the capability of
switching over the network transfer port to the redundant port automatically when the
primary one fails to avoid network disconnection. When the connection is resumed on
the primary network port, the network transfer will be switched over to that port
automatically.

Load balancing: Load balancing refers to the ability to spread network traffic between
two or more network interfaces to optimize the network transfer and enhance the
system performance.