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Page 36 / 85 Scroll up to view Page 31 - 35
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
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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.
Page 38 / 85
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.
Page 39 / 85
TD-W8901N
150Mbps Wireless N ADSL2+ Modem Router User Guide
31
Figure 4-14
Page 40 / 85
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.

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