TD-W8901N

150Mbps Wireless N ADSL2+ Modem Router User Guide

28

•

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 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

192.168.1.100

, and the Start IP Address must be 192.168.1.100 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

TD-W8901N

150Mbps Wireless N ADSL2+ Modem Router User Guide

29

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

ports are checked by default.

¾

DHCP Table

: The information of the DHCP clients will be displayed here

•

Hostname:

Display the name of the DHCP client.

•

IP Address:

Display the IP Address of the DHCP client.

•

MAC Address:

Display the MAC Address of the DHCP client.

•

Status:

Display the status of the assigned IP Address, either

Static

or

Auto

.

Static

indicates that the IP Address is bounded to the MAC Address, while

Auto

indicates that

the IP Address is assigned to the MAC Address automatically.

How to assign a static IP address to the client?

1). Select an

IP Address

from the drop-down list.

2). Enter the

MAC Address

of the client in the table.

•

DNS Relay:

If you want to disable this feature, you just need to set both Primary and

secondary DNS IP to 0.0.0.0. If you want to use DNS relay, you can setup DNS server IP

to 192.168.1.1 on their Computer. If not, the device will perform as no DNS relay.

•

Primary DNS Server:

Type in your preferred DNS server.

•

Secondary DNS Server:

Type in your preferred DNS server.

)

Note:

If

Use Auto Discovered DNS Server Only

is selected in DNS Relay, this router will accept the

first received DNS assignment from one of the PPPoA, PPPoE or MER/DHCP enabled PVC(s)

during the connection establishment. If

Use User Discovered DNS Server Only

is selected in

DNS Relay, it is necessary for you to enter the primary and optional secondary DNS server IP

addresses. After type in the address, click SAVE button to save it and invoke it.

¾

DHCP Relay:

Select

Relay

, then you will see the next screen (shown in Figure 4-13), and the

Router will work as a DHCP Relay. A DHCP relay is a computer that forwards DHCP data

between computers that request IP addresses and the DHCP server that assigns the

addresses. Each of the device's interfaces can be configured as a DHCP relay. If it is enabled,

the DHCP requests from local PCs will forward to the DHCP server runs on WAN side. To

have this function working properly, please run on router mode only, disable the DHCP server

on the LAN port, and make sure the routing table has the correct routing entry.

TD-W8901N

150Mbps Wireless N ADSL2+ Modem Router User Guide

30

Figure 4-13

•

DHCP Server IP for Relay Agent:

Enter the DHCP server IP Address runs on WAN

side.

)

Note:

If you select

Disabled

, the DHCP function will not take effect.

4.3.3 Wireless

Choose “

Interface Setup

→

Wireless

” menu, and you will see the Wireless screen (shown in

Figure 4-14 ). Please configure the parameters for wireless according to the descriptions below.

TD-W8901N

150Mbps Wireless N ADSL2+ Modem Router User Guide

31

Figure 4-14

TD-W8901N

150Mbps Wireless N ADSL2+ Modem Router User Guide

32

¾

Access point Settings:

These are the settings of the access point. You can configure the

rules to allow wireless-equipped computers and other devices to communicate with a wireless

network.

•

Access point:

Select Activated to allow wireless station to associate with the access

point.

•

Channel:

Select your region and the channel you want to use from the drop-down List of

Channel. This field determines which operating frequency will be used. It is not

necessary to change the default channel unless you notice interference problems with

another nearby access point.

•

Transmit Power:

Here you can specify the transmit power of Router. You can select

High, Medium or Low which you would like. High is the default setting and is

recommended.

•

Beacon Interval:

Enter a value between 20-1000 milliseconds. The Beacon Interval

value indicates the frequency interval of the beacon. A beacon is a packet broadcast by

the Router to synchronize the wireless network. The default value is 100.

•

RTS/CTS Threshold:

Should you encounter inconsistent data flow, only minor reduction

of the default value 2347 is recommended. If a network packet is smaller than the preset

RTS threshold size, the RTS/CTS mechanism will not be enabled. The Router sends

Request to Send (RTS) frames to a particular receiving station and negotiates the

sending of a data frame. After receiving an RTS, the wireless station responds with a

Clear to Send (CTS) frame to acknowledge the right to begin transmission. In most cases,

keep its default value of 2347.

•

Fragmentation Threshold:

This value specifies the size for a packet. When packet size

exceeds the fragmentation threshold, the packet will be fragmented into multiple packets.

Setting the Fragmentation Threshold too low may result in poor network performance. In

most cases, it should remain at its default value of 2346.

•

DTIM:

This value, between 1 and 255, indicates the interval of the Delivery Traffic

Indication Message (DTIM). A DTIM field is a countdown field informing clients of the next

window for listening to broadcast and multicast messages. When the Router has buffered

broadcast or multicast messages for associated clients, it sends the next DTIM with a

DTIM Interval value. Its clients hear the beacons and awaken to receive the broadcast

and multicast messages. The default value is 1.

•

Wireless Mode:

In the drop-down list you can select “802.11b”, “802.11g”, “802.11n”,

“802.11b+g”, “802.11g+n” and “802.11b+g+n”. “802.11b+g+n” allows 802.11b, 802.11g

and 802.11n wireless stations to connect to the Router.