TP-Link TD-W8968 User Manual page 24

Enable Fullcone NAT:

Dial on demand (with idle timeout timer):

connection after it has been inactive for a specific period of time (idle timeout), and it will
automatically re-establish the connection as soon as you attempt to access the Internet
again. If your Internet is charged by time, you may want to select this option in order to
save money.
PPP IP extension:

your PC, and the NAT and SPI Firewall will be closed. Sometimes you can think it as bridge
while PPP dialing in the modem router. It's a special feature deployed by some ISP. Unless
your ISP specifically requires this setup, do not select it.
Use Static IPv4 Address:

select this option to enter them manually.
Enable PPP Debug Mode:

many PPP log information in the System Log. Only PPP has this debug Mode.
Bridge PPPoE Frames Between WAN and Local Ports:

connection in your local PC.
Enable IGMP Multicast Proxy:

manage multicasting on TCP/IP networks. Some ISPs use IGMP to perform remote
configuration for client devices, such as the router. The default value is enabled, and if you
are not sure, please contact your ISP or just leave it.
5. Select a preferred wan interface as the system default gateway and click Next.
It is a type of NAT. If not enabled, the default NAT will act.
Select this option to get the public IP address from the PPP server to
If your ISP gives you a
Select this option to debug the PPP function and you can see
IGMP (Internet Group Management Protocol) is used to
The modem router will cut off the Internet
static WAN, Gateway
Select this option to start PPP
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TD-W8968 User Guide
and DNS IP address,