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Page 31 / 77 Scroll up to view Page 26 - 30
TD-8840T
ADSL2+ Modem Router User Guide
25
Figure 4-9
)
Note:
After you finish the Internet configuration, please click
Save
to make the settings take effect.
4.4.2 Interface Grouping
Choose “
Network
”
Æ
“
Interface
Grouping
”, you can view all the current groups on this page
(shown in Figure 4-10).
Figure 4-10
¾
VLAN:
Enable or disable this function. Virtual LAN (VLAN) is a group of devices on one or
more LANs that are configured so that they can communicate as if they were attached to the
same LAN, when in fact they are located on a number of different LAN segments. Because
VLANs are based on logical instead of physical connections, it is very flexible for user/host
management, bandwidth allocation and resource optimization. If you want to active this
function, this function must be enabled.
Page 32 / 77
TD-8840T
ADSL2+ Modem Router User Guide
26
To support this feature, you must create mapping groups with appropriate LAN and WAN
interfaces using the
Add
button. The
Remove
button will remove the grouping and add the
ungrouped interfaces to the Default group. Only the default group has IP interface.
Click the
Add
button. You can add a new interface group in the next screen. For example, you
want LAN1 and LAN3 to be a group called Group 1 over br_0_35_0 WAN interface, you can refer
to the following figure.
Figure 4-11
Click
Save
to make the entry effective immediately
4.4.3 LAN Settings
Choose “
Network
”
Æ
“
LAN Settings
” menu, and you will see the LAN screen (shown in Figure
4-12). Please configure the parameters for LAN ports according to the descriptions below.
Figure 4-12
Page 33 / 77
TD-8840T
ADSL2+ Modem Router User Guide
27
¾
IP Address:
You can configure the Modem Router’s IP Address and Subnet Mask for LAN
Interface.
•
IP Address:
Enter the Modem Router’s local IP Address, then you can access to the
Web-based Utility via the IP Address, the default value is 192.168.1.1.
•
Subnet Mask:
Enter the Modem Router’s Subnet Mask, the default value is
255.255.255.0.
¾
Enable IGMP Snooping:
If you select the option, please choose the IGMP Mode
:
Standard
Mode or Blocking Mode.
¾
Enable Second IP:
You can configure the Modem Router’s second IP Address and Subnet
Mask for LAN Interface through which you can also access to the Web-based Utility as the
default IP Address and Subnet Mask.
¾
DHCP Server:
These settings allow you to configure the Modem Router‘s Dynamic Host
Configuration Protocol (DHCP) server function. The DHCP server is enabled by default for the
Modem Router’s Ethernet LAN interface. DHCP service will supply IP settings to computers
which are configured to automatically obtain IP settings that are connected to the Modem
Router though the Ethernet port. When the Modem Router is set for DHCP, it becomes the
default gateway for DHCP client connected to it. Keep in mind that if you change the IP
address of the Modem Router, you must change the range of IP addresses in the pool used
for DHCP on the LAN.
•
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.
•
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
.
•
Leased 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
1440
minutes.
The detailed configuration about DHCP server, please refer to section
4.5 DHCP Server
.
4.4.4 MAC Clone
Choose menu “
Advanced Setup
”
Æ
“
MAC Clone
”, you can configure the MAC address of the
WAN Interface as shown below.
You can select corresponding WAN Interface from the drop-down list and click
Clone
button to
clone your current PC MAC, and then click
Save
.
Page 34 / 77
TD-8840T
ADSL2+ Modem Router User Guide
28
Figure 4-13
)
Note:
Only the WAN Ports can use MAC Address Clone function. All the clone MAC addresses must not
be the same with each other.
4.4.5 ALG Settings
Choose menu “
Advanced Setup
”
Æ
“
ALG Settings
”, and then you can configure the basic
security in the screen as shown in Figure 4-14.
Figure 4-14
¾
Virtual Private Network (VPN) -
VPN Passthrough must be enabled if you want to allow VPN
tunnels using VPN protocols to pass through the Modem Router.
•
PPTP Pass-through
- Point-to-Point Tunneling Protocol (PPTP) allows the
Point-to-Point Protocol (PPP) to be tunneled through an IP network. To allow PPTP
tunnels to pass through the Modem Router, click
Enable
.
•
L2TP Pass-through
- Layer Two Tunneling Protocol (L2TP) is the method used to
enable Point-to-Point sessions via the Internet on the Layer Two level. To allow L2TP
tunnels to pass through the Modem Router, click
Enable
.
•
IPSec Pass-through
- Internet Protocol security (IPSec) is a suite of protocols for
ensuring private, secure communications over Internet Protocol (IP) networks, through
the use of cryptographic security services. To allow IPSec tunnels to pass through the
Modem Router, click
Enable
.
¾
Application Layer Gateway (ALG) -
It is recommended to enable Application Layer Gateway
(ALG) because ALG allows customized Network Address Translation (NAT) traversal filters to
be plugged into the gateway to support address and port translation for certain application
Page 35 / 77
TD-8840T
ADSL2+ Modem Router User Guide
29
layer "control/data" protocols such as FTP, TFTP etc.
•
FTP ALG
- To allow FTP clients and servers to transfer data across NAT, click
Enable
.
•
TFTP ALG
- To allow TFTP clients and servers to transfer data across NAT, click
Enable
.
Click the
Save
button to save your settings.
4.4.6 DSL Settings
Choose “
Advanced Setup
”
Æ
“
DSL Settings
”, you can select the DSL Modulation Type and
Annex Type in the next screen. The DSL feature can be selected when you meet the physical
connection problem. Please check the proper settings with your Internet service provider.
Figure 4-15
¾
DSL Modulation Type:
Select the DSL operation Modulation Type which your DSL
connection uses.
¾
Annex Type:
Select the DSL operation Annex Type which your DSL connection uses.
Click the
Save
button to save your settings.
4.5 DHCP Server
Choose “
DHCP Server
”, you can see the next submenus:
Click any of them, and you will be able to configure the corresponding function.
4.5.1 DHCP Settings
Choose menu “
DHCP Server
”
Æ
“
DHCP Settings
”, you can configure the DHCP Server on the
page as shown in Figure 4-16.The Modem Router is set up by default as a DHCP (Dynamic Host
Configuration Protocol) server, which provides the TCP/IP configuration for all the PC(s) that are
connected to the Modem Router on the LAN.

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