TP-Link TD-W8970 User Manual page 30

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 is 1500 Bytes. It is not recommended that you change the default
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: It is a type of NAT, if not enabled, the default NAT will act.
 Enable SPI Firewall: A SPI firewall enhances network's security. Select the option to use a
firewall, or else without a firewall.
 Enable IGMP Proxy: IGMP (Internet Group Management Protocol) is used to manage
multicasting on TCP/IP networks. Some ISPs use IGMP to perform remote configuration for
client devices, such as the modem router. The default value is disabled, and if you are not sure,
please contact your ISP or just leave it.
 Get IP with Unicast: This is disabled by default. The minority of DHCP Server of ISP will not
support to enable this. When the Route is connected right but IP cannot get, you can select this
box.
 Set DNS Server manually: Choose "Set DNS Server manually", you can set DNS Server
manually here. The modem router will use this DNS Server for priority.
 Get IPv6 Address with Unicast: This is disabled by default. The minority of DHCPv6 Server
of ISP will not support to enable this. When the modem router is connected right but IPv6
address cannot get, you can select this box.
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TD-W8970 300Mbps Wireless N Gigabit ADSL2+ Modem Router User Guide
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Figure 4-6
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