Comtrend Corporation NexusLink 3120 User Manual page 215

STEP 2: The WAN IP settings screen provides access to the DHCP server settings.
You can select the Obtain an IPv6 address automatically radio button
to enable DHCP (use the DHCP Options only if necessary). However, if you
prefer, you can use the Static IPv6 address method instead to assign
WAN IP address, Subnet Mask and Default Gateway manually.
Enter information provided to you by your ISP to configure the WAN IPv6 settings.
Notice: If "Obtain an IPv6 address automatically" is chosen, DHCP client will be
enabled on this WAN interface.
If "Use the following Static IPv6 address" is chosen, enter the static WAN IPv6
address. If the address prefix length is not specified, it will be default to /64.
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