D-Link DIR-842 Quick Installation Manual page 21

DIR-842 Quick Installation Guide
If you want to manually assign the LAN IPv4 address for DIR-842, do not
select the Automatic obtainment of IPv4 address checkbox and fill in
the IP address, Subnet mask, Hostname fields and, if needed, the
Gateway IP address field. Make sure that the assigned address does not
coincide with the LAN IPv4 address of the router to which your device
connects.
3. Click the NEXT button.
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