TP-Link TD-W9970 User Manual page 97

Enable: Check the box to enable IPv6 Tunnel function. It is disabled by default.

Mechanism: Select a type for IPv6 tunnel from the drop-down list. DS-Lite, 6RD and 6to4 are

supported.
1) DS-Lite
This type is used in the situation that your WAN connection is IPv6 while LAN connection is IPv4.
Select DS-Lite, and you will see the screen as shown below.
WAN Connection:

WAN connections can be shown in the drop-down list.
Configuration Type:

Remote IPv6 Address automatically while Manual means you set it manually.
Remote IPv6 Address:


Note:
In this type, there should not have any IP v4 WAN connections. If there are IP v4 WAN connections, the
page will prompt you to delete all the IPv4 WAN
2) 6RD
This type is used in the situation that your WAN connection is IPv4 while LAN connection is IPv6.
Select 6RD, and you will see the screen as shown below.
Select a WAN connection from the drop-down list. Only the connected
Select a configuration type for this tunnel. Auto means to obtain the
Enter the IPv6 address of the remote node.
connections.
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TD-W9970 User Guide