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Secondary DNS Enter the IP address of alternative DNS server if there are two DNS 
servers. By default, it is 0.0.0.0, which means no secondary DNS is 
assigned.
Lease Time Enter the amount time of the leased IP address assigned by the DHCP 
server. When the time expires, the clients will request to renew the lease 
automatically.
Address 
Reservation
Enable Address Reservation and specify a reserved IP address for a 
PC on the local area network, so the PC will always obtain the same IP 
address each time when it starts up. Reserved IP addresses could be 
assigned to servers that require permanent IP settings.
To configure Address Reservation:
Click 
Add
, specify the MAC address and the IP address. Enable this 
entry, then click 
Save
.
IPv6 Enable or disable the IPv6 function. If the IPv6 function is enabled, the 
device will obtain a LAN IPv6 address. Select a method for the device to 
obtain the LAN IPv6 address according to the information provided by 
your ISP.
• 6WDWLF
Select static and enter the LAN IPv6 address and IPv6 netmask.
• SLAAC
Select SLAAC and the device will obtain the LAN IPv6 address 
automatically.
• '+&3Y
Select DHCPv6 and the device will obtain the LAN IPv6 address 
automatically.