DIR-825 Quick Installation Guide
4. IPv4 address assignment. By default, the built-in DHCP server of 
the router assigns IPv4 addresses to the devices of the LAN. If you want 
to manually assign IPv4 addresses, disable the DHCP server (click the 
IPv4 tab and select the Disable value from the Mode of dynamic IP 
address assignment drop-down list in the Dynamic IP Addresses 
section).
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