TP-Link TD-W9970 User Manual page 26

Click Advance, advanced selections for WAN Service Setup can be shown.
MTU (Bytes): Maximum Transmission Unit Size. Check this box then you can change the MTU

size. The default MTU
value unless required by your ISP.
Enable NAT: This technology translates the IP addresses of a local area network to a different

IP address for the Internet. If this modem router is hosting your network's connection to the
Internet, please select the check box. If another Router exists in your network, you don't need
to select the option.
Enable Fullcone NAT:

Enable SPI Firewall:

firewall, or else without a firewall.
Enable IGMP Proxy:

multicasting on TCP/IP networks. Some ISPs use IGMP to perform remote configuration for
value is 1500 Bytes. It is not recommended that you change the default
It is a type of NAT, if not enabled, the default NAT will act.
A SPI firewall enhances network's security. Select the option to use a
IGMP (Internet Group Management Protocol) is used to manage
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TD-W9970 User Guide