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Page 51 / 85 Scroll up to view Page 46 - 50
TD-W8901N
150Mbps Wireless N ADSL2+ Modem Router User Guide
43
4.4.3 NAT
Choose “
Advanced Setup
→
NAT
” menu, you can setup the NAT (Network Address Translation)
function for the Router (shown in Figure 4-28).
)
Note:
To use the NAT function, the Virtual Circuit should not be configured to Bridge mode. You can
change the mode in Figure 4-6.
Figure 4-28
¾
Virtual Circuit:
Enter Virtual Circuit Index that you plan to setup for the NAT function.
¾
NAT Status:
This field shows the current status of the NAT function for the current VC. You
can go to the previous screen (shown in Figure 4-6) to activate the function.
¾
Number of IPs;
This field is to specify how many IPs are provided by your ISP for current VC.
It can be single IP or multiple IPs. We select Multiple to explain.
)
Note:
For VCs with single IP, they share the same DMZ and Virtual servers; for VCs with multiple IPs,
each VC can set DMZ and Virtual servers. Furthermore, for VCs with multiple IPs, they can define
the Address Mapping rules; for VCs with single IP, since they have only one IP, there is no need to
individually define the Address Mapping rule.
4.4.3.1 DMZ
Choose “
Advanced Setup
→
NAT
→
DMZ
” in Figure 4-28, you can configure the DMZ host in the
next screen. A DMZ (demilitarized zone) is a host between a private local network and the outside
public network. It prevents outside users from getting direct access to a server that has company
data. Users of the public network outside the company can access to the DMZ host.
Page 52 / 85
TD-W8901N
150Mbps Wireless N ADSL2+ Modem Router User Guide
44
Figure 4-29
¾
DMZ Host IP Address:
Enter the specified IP Address for DMZ host on the LAN side.
4.4.3.2 Virtual Server
Choose “
Advanced Setup
→
NAT
→
Virtual Server
” in Figure 4-28, you can configure the Virtual
Server in the next screen.
The Virtual Server is the server or server(s) behind NAT (on the LAN), for example, Web server or
FTP server, that you can make visible to the outside world even though NAT makes your whole
inside network appear as a single machine to the outside world.
Figure 4-30
¾
Rule Index:
The Virtual server rule index for this VC. You can specify 10 rules in maximum.
All the VCs with single IP will use the same Virtual Server rules.
¾
Application:
The Virtual servers can be used for setting up public services on your LAN.
¾
Protocol:
The protocol used for this application.
¾
Start
&
End port number:
Enter the specific Start and End Port number you want to forward.
If it is one port only, you can enter the End port number the same as Start port number. For
example, if you want to set the FTP Virtual server, you can set the start and end port number
to 21.
¾
Local IP Address:
Enter the IP Address for the Virtual Server in LAN side.
Page 53 / 85
TD-W8901N
150Mbps Wireless N ADSL2+ Modem Router User Guide
45
¾
Virtual Server Listing:
This displays the information about the Virtual Servers you establish.
To add a virtual server entry:
Step 1:
Select the “Virtual Circuit” and select “
Virtual Server”.
)
Note:
For VCs with single IP, select Single; For VCs with multiple IPs, select Multiple for the option.
Step 2:
Select the Rule index for the rule as shown in Figure 4-30.
Step 3:
Select the application you want from drop-down list, then the protocol and port number
will be added to the corresponding field automatically, you only need to configure the IP
address for the virtual server; If the application list does not contain the service that you
want, please configure the Port number, IP Address and Protocol manually.
Step 4:
After that, click
SAVE
to make the entry take effect.
Other operations for the entries as shown in Figure 4-30:
Enter the index of assigned entry, and click the
DELETE
button to delete the entry.
Click the
BACK
button to return to the previous screen.
Click the
CANCEL
button to cancel the configuration which is made just now.
4.4.3.3 IP Address Mapping
Select
Multiple
for
numbers of IPs
in Figure 4-28, and choose “
Advanced Setup
→
NAT
→
IP
Address Mapping(for Multiple IP Service)
”. You can configure the Address Mapping Rule in the
next screen. The IP Address Mapping is for those VCs that configured with multiple IPs. The IP
Address Mapping rule is per-VC based (only for Multiple IPs' VCs).
Figure 4-31
¾
Rule Index:
Select the Virtual server rule index for this VC. You can specify 8 rules in
maximum.
Page 54 / 85
TD-W8901N
150Mbps Wireless N ADSL2+ Modem Router User Guide
46
¾
Rule Typ:
There are four types: one-to-one, Many-to-One, Many-to-Many Overload and
Many-to-Many No-overload.
¾
Local Start & End IP:
Enter the local IP Address you plan to map to. Local Start IP is the
starting local IP address and Local End IP is the ending local IP address. If the rule is for all
local IPs, then the Start IP is 0.0.0.0 and the End IP is 255.255.255.255.
¾
Public Start & End IP:
Enter the public IP Address you want to do NAT. Public Start IP is the
starting public IP address and Public End IP is the ending public IP address. If you have a
dynamic IP, enter 0.0.0.0 as the Public Start IP.
¾
Address Mapping List:
This displays the information about the Mapping addresses.
To add a mapping rule:
Step 1:
Select the “Virtual Circuit” and Multiple for the “Number of IPs”. Then select the tab
IP
Address Mapping
(shown in Figure 4-28).
)
Note:
IP Address Mapping is only available for VCs with Multiple IPs.
Step 2:
Select the Rule index for the rule as shown in Figure 4-31.
Step 3:
Select the rule type you want from the drop-down list.
Step 4:
Enter the local and public IP addresses in the corresponding fields.
Step 5:
After that, click
SAVE
to make the entry take effect.
Other operations for the entries as shown in Figure 4-31:
Select the index of assigned entry, and click the
DELETE
button to delete the entry.
Click the
BACK
button to return to the previous screen.
Click the
CANCEL
button to cancel the configuration which is made just now.
4.4.4 QoS
Choose “
Advanced Setup
→
QoS
”, you can configure the QoS in the next screen. QoS helps to
prioritize data as it enters your router. By attaching special identification marks or headers to
incoming packets, QoS determines which queue the packets enter, based priority. This is useful
when there are certain types of data you want to give higher priority, such as voice data packets
give higher priority than Web data packets. This option will provide better service of selected
network traffic over various technologies.
Page 55 / 85
TD-W8901N
150Mbps Wireless N ADSL2+ Modem Router User Guide
47
Figure 4-32
¾
QoS:
Select this option to Activate/Deactivate the IP QoS on different types (IP ToS and
DiffServ).
¾
Summary:
Click the button to view the configurations of QoS.
¾
Rule:
Configure the rules for QoS. If the traffic complies with the rule, then the Router will take
the corresponding action to deal with it.
•
Rule Index:
Select the index for the rule you want to configure.
•
Active:
Activate the rule. The rule can take effect only when it is activated.

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