LevelOne VOI-8001 - Manual (Page 94)

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Static DNS Server
Check this item to make the primary and secondary DNS server at the
next two rows active. If this field is not enabled, the statically configured
DNS server will not take effect.
Domain Name Server (DNS) Address
Set your primary DNS in this field.
Secondary DNS Address (optional)
Set your secondary DNS to use when the primary DNS does not work.