QNAP Security VioStor NVR (Version: 4.1.2) - Manual (Page 143)

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Load balancing
Load balancing enables the network resources to spread between two or more network
interfaces to optimize the network transfer and enhance the system performance. It
operates on layer 3 protocol (IP, NCP IPX) only. Multicast/broadcast and other
non-routable protocols such as NetBEUI can only be transferred via the main network
port.
Note: To optimize the network transfer speed of the NVR in load balancing mode, use
a managed Ethernet switch and enable 802.3ad (or link aggregation) on the ports of
the switch that the Gigabit LAN ports of the NVR are connected to.