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TD-W8951NB 150Mbps Wireless N ADSL2+ Modem Router (Annex B) User Guide

• Multicast: Select IGMP version, or disable the function. IGMP (Internet Group Multicast

Protocol) is a session-layer protocol used to establish membership in a multicast group.

The ADSL ATU-R supports both IGMP version 1 (IGMP v1), IGMP v2 and IGMP v3.

Select “Disabled” to disable it.

• IGMP Snoop: Enable the IGMP Snoop function if you need.

¾ DHCP Server: Select Enabled, then you will see the screen below (shown in Figure 4-12).

The Router will work as a DHCP Server; it becomes the default gateway for DHCP client

connected to it. DHCP stands for Dynamic Host Control Protocol. The DHCP Server gives out

IP addresses when a device is booting up and request an IP address to be logged on to the

network. That device must be set as a DHCP client to obtain the IP address automatically. By

default, the DHCP Server is enabled. The DHCP address pool contains the range of the IP

address that will automatically be assigned to the clients on the network.

Figure 4-12

• Starting IP Address: Enter the starting IP address for the DHCP server's IP assignment.

Because the default IP address for the Router is 192.168.1.1, the default Start IP

Address is 192.168.1.2, and the Start IP Address must be 192.168.1.2 or greater, but

smaller than 192.168.1.254.

• IP Pool Count: The max user pool size.

• Lease Time: The length of time for the IP lease. After the dynamic IP address has

expired, the user will be automatically assigned a new dynamic IP address. The default is

259200 seconds.

• Physical Ports: If a physical port is unchecked, the client connected to that port will not

be able to obtain IP address automatically although the DHCP function is enabled. All the

ports are checked by default.