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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 4-16).

Figure 4-16

Click

ADD ROUTE

button to add a new route in the next screen (shown in Figure 4-17).

Figure 4-17

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 set up the NAT (Network Address Translation)

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function for the Router (shown in Figure 4-18).

Figure 4-18

¾

Virtual Circuit:

Enter Virtual Circuit Index that you plan to set up 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 4-18, 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 4-19

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 4-18, 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

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inside network appear as a single machine to the outside world.

Figure 4-20

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

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, 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 “Number of IPs”. (shown in Figure 4-18).

)

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 4-20.

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 are as follows:

Enter the index of assigned entry, 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.

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4.4.3.3. IP Address Mapping

Choose “

Advanced Setup

→

NAT

”, select

Multiple

in

Number of IPs

. Click

IP Address Mapping

,

then you can configure the Address Mapping Rule in Figure 4-22. 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 4-21

Figure 4-22

¾

Rule Index:

Select the Address Mapping Rule index for this VC. You can specify 8 rules in

maximum.

¾

Rule Type:

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 mapped 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

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Address Mapping

(shown in Figure 4-21).

)

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 4-22.

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 are as follows:

Enter the index of assigned entry, 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.