TD-8840T

ADSL2+ Modem Router User Guide

30

Figure 4-16

¾

Start IP Address:

Enter a value for the DHCP server to start with when issuing IP addresses.

Because the default IP address for the Modem 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.

¾

End IP Address:

Enter a value for the DHCP server to end with when issuing IP addresses.

The End IP Address must be smaller than 192.168.1.254. The default End IP Address is

192.168.1.254

.

¾

Address Lease Time:

The Leased Time is the amount of time in which a network user will be

allowed connection to the Modem Router with their current dynamic IP address. Enter the

amount of time, in hours, then the user will be “leased” this dynamic IP address. After the

dynamic IP address has expired, the user will be automatically assigned a new dynamic IP

address. The default is

24

hours.

¾

Default Gateway -

(Optional.) It is suggested to input the IP address of the LAN port of the

Modem Router. The default value is 192.168.1.1.

¾

Default Domain -

(Optional.) Input the domain name of your network.

¾

Primary DNS -

(Optional.) Input the DNS IP address provided by your ISP or consult your

ISP.

¾

Secondary DNS -

(Optional.) Input the IP address of another DNS server if your ISP

provides two DNS servers.

¾

DHCP Relay:

Select

Relay

, then you will see the next screen, and the Modem 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-8840T

ADSL2+ Modem Router User Guide

31

)

Note:

1)

To use the DHCP server function of the Modem Router, you must configure all computers on

the LAN as "Obtain an IP Address automatically".

2)

You have to disable NAT of the WAN connections, or the DHCP Relay may not take effect.

3)

If you select

Disabled

, the DHCP function will not take effect.

Click the

Save

button to save your settings.

4.5.2 Clients List

Choose menu “

DHCP Server

”

Æ

“

Clients List

”, you can view the information about the clients

attached to the Modem Router in the screen as shown in Figure 4-17.

Figure 4-17

¾

Client Name

:

The name of the DHCP client

¾

MAC Address

:

The MAC address of the DHCP client

¾

IP Address

:

The IP address that the Modem Router has allocated to the DHCP client

¾

Valid Time

:

The time of the DHCP client leased. After the dynamic IP address has expired,

a new dynamic IP address will be automatically assigned to the user.

You cannot change any of the values on this page. To update this page and to show the current

attached devices, click the

Refresh

button.

4.5.3 Address Reservation

Choose menu “

DHCP Server

”

Æ

“

Address Reservation

”, you can view and add a reserved

address for clients via the next screen (shown in Figure 4-18).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 the servers that require

permanent IP settings.

TD-8840T

ADSL2+ Modem Router User Guide

32

Figure 4-18

¾

MAC Address:

The MAC address of the PC for which you want to reserve an IP address.

¾

IP Address:

The IP address reserved for the PC by the Modem Router.

¾

Status:

The status of this entry either

Enabled

or

Disabled

.

To Reserve an IP address:

1.

Click the

Add New

button. Then Figure 4-19 will pop up.

2.

Enter the MAC address (in XX:XX:XX:XX:XX:XX format.) and IP address (in dotted-decimal

notation) of the computer for which you want to reserve an IP address.

3.

Click the

Save

button.

Figure 4-19

To modify or delete an existing entry:

1.

Click the

Edit

in the entry you want to modify. If you want to delete the entry, click the

Delete

.

2.

Modify the information.

3.

Click the

Save

button.

Click the

Enable/Disable Selected

button to make selected entries enabled/disabled.

Click the

Delete Selected

button to selected entries.

4.5.4 Conditional Pool

Choose menu “

DHCP Server

”

Æ

“

Conditional Pool

”, you can see the next screen (shown in

Figure 4-20). This page displays vendor class settings and allows you to set parameters for

vendor class by clicking corresponding buttons.

TD-8840T

ADSL2+ Modem Router User Guide

33

Figure 4-20

To add a

vendor class:

1.

Click the

Add New

button. Then Figure 4-21 will pop up.

2.

Enter parameters for the vendor class.

Click the

Save

button.

Figure 4-21

To modify or delete an existing entry:

4.

Click the

Edit

in the entry you want to modify. If you want to delete the entry, click the

Delete

.

5.

Modify the information.

6.

Click the

Save

button.

Click the

Enable/Disable Selected

button to make selected entries enabled/disabled.

Click the

Delete Selected

button to selected entries.

4.6 Route Settings

Choose “

Route Settings

”, it includes three menus

: Default Gateway

,

Static Route and RIP

Settings

. The detailed descriptions are provided below.

TD-8840T

ADSL2+ Modem Router User Guide

34

4.6.1 Default Gateway

Choose “

Route Settings

”

Æ

“

Default Gateway

”, you can see the Default Gateway screen. You

can select a WAN Interface from the drop-down list as the system default gateway.

Figure 4-22

Click the

Add Interface

button, you can add WAN Interfaces.

Click the

Save

button to save your settings.

4.6.2 Static Route

Choose “

Route Settings

”

Æ

“

Static Route

”. You can see the Static Route screen, this screen

allows you to configure the static routes (shown in Figure 4-23). A static route is a pre-determined

path that network information must travel to reach a specific host or network.

Figure 4-23

To add static routing entries:

1.

Click the

Add New

button in Figure 4-23, and you will see the screen as shown in Figure

4-24.