DIR-842 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).
5. IPv6   address   assignment.   By   default,   the   devices   of   the   LAN
automatically assign IPv6 addresses to themselves (the Stateless value
is selected from the  Mode of dynamic IPv6 address assignment
drop-down list in the  Dynamic IPv6 Addresses section on the IPv6
tab).  If   the   devices   of   the   LAN   do   not   support   IPv6   address
autoconfiguration, use the built-in DHCPv6 server of the router (select
the  Stateful  value   from   the  Mode   of   dynamic   IPv6   address
assignment drop-down list).
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