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Primary DNS Enter the DNS IP address provided by your ISP.
Secondary DNS Enter alternative DNS IP address if your ISP provides it.
IPv6 Enable or disable the IPv6 function. If the IPv6 function is enabled, the 
device will obtain a WAN IPv6 address. Select a method for the device to 
obtain the WAN IPv6 address according to the information provided by 
your ISP.
• 6WDWLF
Select static and enter the WAN IPv6 address, IPv6 netmask, IPv6 
gateway, primary DNS and secondary DNS provided by your ISP.
• SLAAC
Select SLAAC and the device will obtain the WAN IPv6 address 
automatically.
• '+&3Y
Select DHCPv6 and the device will obtain the WAN IPv6 address 
automatically.
MTU Size The normal MTU (Maximum Transmission Unit) value for most Ethernet 
networks is 1500 Bytes. For some ISPs you need to modify the MTU. But 
this is rarely required, and should not be done unless you are sure it is 
necessary for your ISP connection. This number should be an integer 
between 576 and 2026.
WAN MAC 
Address
Specify the MAC address of WAN interface. This field displays the 
current MAC address of the WAN port. If your ISP requires that you 
register the MAC address, enter the correct MAC address into this 
field. The format for the MAC Address is XX-XX-XX-XX-XX-XX (X is 
any hexadecimal digit). Click 
Restore Factory MAC
 to restore the MAC 
address of WAN port to the factory default value.