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

The TP-Link TD-8840 is a versatile ADSL modem/router that has been designed for home and small office use. Known for its robust performance and ease of use, this device combines the functionality of a modem and a router, offering users a cost-effective solution for high-speed internet access.

One of the main features of the TD-8840 is its ADSL2+ support, which enables internet speeds of up to 24 Mbps downstream and 1 Mbps upstream. This capability allows users to enjoy seamless browsing, streaming, and online gaming experiences. The modem is compatible with various ADSL standards, making it a flexible choice for different ISP offerings.

In terms of connectivity, the TD-8840 comes equipped with four Ethernet ports, allowing users to connect multiple devices directly through wired connections. This is particularly beneficial for businesses or households with several computers and devices, ensuring stable and high-speed internet access for all. Additionally, it offers a USB port for connecting to storage devices, facilitating easy file sharing and access across the network.

Security is another paramount feature of the TD-8840. The device supports various encryption protocols, including WPA and WPA2, providing a secure wireless environment for users. Moreover, it includes a built-in firewall that protects the network from external threats, ensuring that users can browse the internet safely.

Setting up the TP-Link TD-8840 is straightforward, thanks to the intuitive web UI. The installation process is guided, allowing users to get online quickly without needing extensive technical knowledge. The modem also offers features such as DHCP server, NAT, and IP QoS, further enhancing its functionality.

Compatibility is another strength of the TD-8840, as it works with a wide range of ISPs, making it a popular choice for many users. The device's compact design and robust build quality ensure durability, making it a reliable investment for long-term use.

In conclusion, the TP-Link TD-8840 is an excellent modem/router choice for those seeking a reliable, high-speed internet connection. With its ADSL2+ support, multiple Ethernet ports, and strong security features, it meets the demands of modern households and small businesses. Its ease of setup and wide compatibility with ISPs further enhance its appeal, making it a noteworthy option in the crowded networking market.
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