Oki B412dn User Manual page 243

If the Problem Still Persists
1.
Select [System Preferences] from [Apple Menu].
2.
Select [Network] from the [Show] menu.
3.
Check that [Ethernet] (or [Ethernet 1], [Ethernet 2], [USB Ethernet], [Thunderbolt Ethernet], or other
options) is displayed.
4.
Select [Ethernet] (or the same option as the above step), and then check that [IP Address], [SUBNET
MASK], and [Router] are correct.
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