Tenda D301-V2 User Manual page 46

Wireless Modem Router
To obtain an IP address automatically:
Select Obtain an IP address automatically.
Check Launch Dhcp6c for Prefix Delegation (IAPD).
If your ISP is using stateful DHCPv6, check Launch Dhcp6c for Address Assignment (IANA) also.
Click Next -> Next -> Apply/Save.
To configure a static IPv6 address
Select Use the following Static IPv6 address.
Configure WAN IPv6 Address/Prefix Length and WAN Next-Hop IPv6 Address.
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