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Page 26 / 77 Scroll up to view Page 21 - 25
TD-8840T
ADSL2+ Modem Router User Guide
20
¾
Default Gateway:
select a WAN Interface from the drop-down list as the IPv4 default
gateway.
¾
MTU (bytes):
Maximum Transmission Unit Size. Check this box then you can change the MTU
size. The default
MTU
value is 1500 Bytes. It is not recommended that you change the default
value unless required by your ISP.
¾
Enable NAT:
This technology translates the IP addresses of a local area network to a different
IP address for the Internet. If this Modem Router is hosting your network’s connection to the
Internet, please select the check box. If another Router exists in your network, you don’t need
to select the option.
¾
Enable Fullcone NAT
: It is a type of NAT, if not enabled, the default NAT will act.
¾
Enable SPI Firewall:
A SPI firewall enhances network’s security. Select the option to use a
firewall, or else without a firewall.
¾
Enable
IGMP Proxy
: IGMP (Internet Group Management Protocol) is used to manage
multicasting on TCP/IP networks. Some ISPs use IGMP to perform remote configuration for
client devices, such as the Modem Router. The default value is disabled, and if you are not
sure, please contact your ISP or just leave it.
Click the
Save
button to save the settings.
4.4.1.2 Dynamic IP
Select this option, the Modem Router will be able to obtain IP network information dynamically
from a DHCP server provided by your ISP.
Page 27 / 77
TD-8840T
ADSL2+ Modem Router User Guide
21
Figure 4-5
Click
Advanced
, advanced selections for WAN Service Setup can be shown.
¾
MTU (bytes):
Maximum Transmission Unit Size. Check this box then you can change the MTU
size. The default
MTU
value is 1500 Bytes. It is not recommended that you change the default
value unless required by your ISP.
¾
Enable NAT:
This technology translates the IP addresses of a local area network to a different
IP address for the Internet. If this Modem Router is hosting your network’s connection to the
Internet, please select the check box. If another Router exists in your network, you don’t need
to select the option.
¾
Enable Fullcone NAT
: It is a type of NAT, if not enabled, the default NAT will act.
¾
Enable SPI Firewall:
A SPI firewall enhances network’s security. Select the option to use a
firewall, or else without a firewall.
¾
Enable
IGMP Proxy
: IGMP (Internet Group Management Protocol) is used to manage
multicasting on TCP/IP networks. Some ISPs use IGMP to perform remote configuration for
client devices, such as the Modem Router. The default value is disabled, and if you are not
sure, please contact your ISP or just leave it.
¾
Get IP Unicast:
This is disabled
by default. The minority of DHCP Server of ISP will not
support to enable this. When the Route is connected right but IP cannot get, you can select
this box.
Page 28 / 77
TD-8840T
ADSL2+ Modem Router User Guide
22
¾
Primary DNS Server/ Secondary DNS Server:
Choose
“Set DNS Server manually”, you can
set DNS Server (at least one) manually here. The Route will use this DNS Server for priority.
Click the
Save
button to save the settings.
4.4.1.3 PPPoE
If your ISP provides a
PPPoE
connection and you need to use an ATM Interface, choose
PPPoE
in the drop-down list, and then the screen will be displayed as below.
Figure 4-6
¾
PPP Username/Password/Confirm Password
: Enter the User Name, Password and
Confirm Password provided by your ISP. These fields are case-sensitive.
¾
Authentication Method
: Select the
Authentication Method
from the drop-down list, the
default method is
AUTO_AUTH
, and you can leave it as a default setting.
Page 29 / 77
TD-8840T
ADSL2+ Modem Router User Guide
23
¾
Choose the right connection type according to your needs:
For PPPoE connection, you
can select
Connect on demand
or
Connect automatically
or
Connect manually
. Connect
on demand is dependent on the traffic. If there is no traffic (or
Idle
) for a pre-specified period
of time), the connection will tear down automatically. And once there is traffic send or receive,
the connection will be automatically on.
Click
Advanced
, advanced selections for WAN Service Setup can be shown.
¾
Service Name/Server Name
: Enter the Service Name and Server Name if it was provided by
your ISP. You can leave them blank, if the ISP doesn’t provide them.
4.4.1.4 PPPoA
If your ISP provides a
PPPoA
connection and you need to use an ATM Interface, choose
PPPoA
in the drop-down list, and then the screen will be displayed as below.
The configuration is similar to
PPPoE
. Please refer to the section
4.4.1.3 PPPoE
to configure this
part.
Figure 4-7
Page 30 / 77
TD-8840T
ADSL2+ Modem Router User Guide
24
4.4.1.5 IPoA
If your ISP provides an IPoA connection, select
IPoA
option for the
WAN service type
on the
screen.
Figure 4-8
¾
IP Address/Subnet Mask:
Enter the IP Address and Subnet Mask provided by ISP. If you
forget, you can ask your ISP.
¾
DNS Server/Secondary DNS Server:
Type in your preferred DNS server.
¾
Default Gateway:
select a WAN Interface from the drop-down list as the IPv4 default
gateway.
4.4.1.6 Bridge
If you select this type of connection, the modem can be configured to act as a bridging device
between your LAN and your ISP. Bridges are devices that enable two or more networks to
communicate as if they are two segments of the same physical LAN.

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