TP-Link TD-W9970 User Manual page 34

WAN Service Setup:
Enable IPv4：Check the box to enable IPv4.

IP Address: Enter the IP address in dotted-decimal notation provided by your ISP.

Subnet Mask: Enter the subnet mask in dotted-decimal notation provided by your ISP, usually

it is 255.255.255.0.
Gateway (Optional):

your ISP.
DNS Server/Secondary DNS Server:

The router will use this DNS Server for priority.
Default Gateway:

gateway.
Enable IPv6: Check the box to enable IPv6.

IPv6 Address: Enter the IPv6 address provided by your ISP.

Enter the gateway IP address in dotted-decimal notation provided by
Here you can set DNS Server (at least one) manually.
Select a WAN Interface from the drop-down list as the IPv4 default
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TD-W9970 User Guide