TP-Link TD-8840 manual ADSL2+ Modem Router User Guide, To Reserve an IP address：

TD-8840

ADSL2+ Modem Router User Guide

)Note:

a.If you change the IP Address of LAN, you must use the new IP Address to log in the Router.

b.If the new LAN IP Address you set is not in the same subnet, the IP Address pool of the DHCP server will change accordingly at the same time，while the Virtual Server and DMZ Host will not take effect until they are re-configured.

¾Disable/Enable DHCP Server - Disable or Enable the DHCP server. DHCP stands for Dynamic Host Configuration Protocol. The DHCP Server will automatically assign dynamic IP addresses to the computers on the network. If you disable the Server, you must have another DHCP server within your network or else you must configure the computer manually. The following options are available only when DHCP Server is enabled.

z Start IP Address - Specify an IP address for the DHCP Server to start with when assigning IP addresses. 192.168.1.100 is the default start address

z End IP Address - Specify an IP address for the DHCP Server to end with when assigning IP addresses. 192.168.1.199 is the default end address.

z Leased Time (hour) - The Lease Time is the amount of time a network user will be allowed connection to the Router with their current dynamic IP address. Enter the amount of time, in hours, and the user will be "leased" this dynamic IP address. After the time is up, the user will be automatically assigned a new dynamic IP address. The default value is 24 hours.

¾Set Address Reservation - Click this button, you can view and add a reserved address for clients via the Address Reservation page as shown in Figure 4-21.When you specify a reserved IP address for a PC on the LAN, that PC will always receive the same IP address each time when it accesses the DHCP server. Reserved IP addresses should be assigned to servers that require permanent IP settings.

¾Configure the second IP Address and Subnet Mask for LAN interface - Check this box, and you can configure a second IP address and subnet mask for the LAN interface.

¾Save - Clicking this button only saves the LAN configuration data.

¾Save/Reboot - Clicking this button not only saves the LAN configuration data but also reboots the Router to make the new configuration take effect.

To Reserve an IP address：

1.Click the Set Address Reservation button shown in Figure 4-21to enter the screen as shown in Figure 4-22.

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