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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