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Page 41 / 73 Scroll up to view Page 36 - 40
TD-W8901G
54Mbps Wireless ADSL2+ Modem Router User Guide
4.4
Advanced Setup
Choose “
Advanced Setup
”, you can see the next submenus:
Figure 4-21
Click any of them, and you will be able to configure the corresponding function.
4.4.1 Firewall
Choose “
Advanced Setup
→
Firewall
” menu, and you will see the next screen (shown in Figure
4-22).
Figure 4-22
¾
Firewall:
Select this option can automatically detect and block Denial of Service (DoS)
attacks, such as Ping of Death, SYN Flood, Port Scan and Land Attack.
¾
SPI:
If you enable SPI, all traffics initiated from WAN would be blocked, including DMZ, Virtual
Server, and ACL WAN side.
4.4.2 Routing
Choose “
Advanced Setup
→
Routing
” menu, and you will see the routing information in the next
screen (shown in Figure 4-23).
35
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TD-W8901G
54Mbps Wireless ADSL2+ Modem Router User Guide
Figure 4-23
Click
ADD ROUTE
button to add a new route in the next screen (shown in Figure 4-24).
Figure 4-24
¾
Destination IP Address:
This parameter specifies the IP network address of the final
destination.
¾
IP Subnet Mask:
Enter the subnet mask for this destination.
¾
Gateway IP Address:
Enter the IP address of the gateway. The gateway is an immediate
neighbor of your ADSL Router that will forward the packet to the destination. On the LAN, the
gateway must be a router on the same segment as your Router; over Internet (WAN), the
gateway must be the IP address of one of the remote nodes.
¾
Metric:
Metric represents the "cost" of transmission for routing purposes. IP Routing uses hop
count as the measurement of cost, with a minimum of 1 for directly connected networks. Enter
a number that approximates the cost for this link. The number need not to be precise, but it
must between 1 and 15. In practice, 2 or 3 is usually a good number.
¾
Announced in RIP:
This parameter determines if the ADSL router will include the route to
this remote node in its RIP broadcasts. If set to Yes, the route to this remote node will be
propagated to other hosts through RIP broadcasts. If No, this route is kept private and is not
included in RIP broadcasts.
4.4.3 NAT
Choose “
Advanced Setup
→
NAT
” menu, you can setup the NAT (Network Address Translation)
function for the Router (shown in Figure 4-25).
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TD-W8901G
54Mbps Wireless ADSL2+ Modem Router User Guide
Figure 4-25
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 4-25, 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.
Figure 4-26
¾
DMZ Host IP Address:
Enter the specified IP Address for DMZ host on the LAN side.
37
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TD-W8901G
54Mbps Wireless ADSL2+ Modem Router User Guide
4.4.3.2. Virtual Server
Choose “
Advanced Setup
→
NAT
→
Virtual Server
” in Figure 4-25, 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 4-27
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.
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 4-27.
Step 3:
Select the application you want from drop-down list, then the protocol and port number
38
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TD-W8901G
54Mbps Wireless ADSL2+ Modem Router User Guide
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 4-27:
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 4-25, 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 4-28
¾
Rule Index:
Select the Virtual server rule index for this VC. You can specify 8 rules in
maximum.
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.
39

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