LevelOne 4-bay Sata NAS w/2 Gigabit Ethernet GNS-8000B - Manual (Page 43)

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Configuration of Network Interfaces
Fail Over (Default)
The system supports the configuration of multiple network interfaces, which
enables you to perform Fail Over or Load Balance functions. Fail over
ensures server availability to the network. If the primary port is
disconnected due to a hardware or cable problem, the secondary port will
replace its network identity. If the failed port resumes the network
connection, it will also resume the role as the primary interface.