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For example:

If you want to set up a FTP Server on LAN host 192.168.1.33, you can configure a

virtual server rule as follows:

Step 1:

Select “FTP” from

Usual Service Name

drop-down list.

Protocol

,

WAN Port

, and

LAN

Open Port

will be automatically filled, and you don

’t need to change them.

Step 2:

Select the

WAN Setting

for the service.

Step 3:

Enter 192.168.1.33 in

LAN IP Address

field.

Step 4:

Click

Apply Changes

button to save your configuration. And the Virtual Server will be

added to the

Current Virtual Server Forwarding Table

.

Step 5:

Click

Save

button on the left panel to make sure your configuration can still take effect

after the Router reboots.

4.3.2.3. ALG

Choose “

Advanced→NAT→ALG

”, and then you can configure the ALG settings in the screen as

shown in Figure 4-28. The router supports several NAT ALG and pass-Through function. Here you

can enable or disable the ALG or pass-through function for each application.

Figure 4-28

Click the

Apply Changes

button to save your configuration.



Note:

After configuration, you need to click the

Save

button appeared on the left panel so that your

configuration can still take effect after the Router reboots.

4.3.2.4. Port Trigger

Choose “

Advanced→NAT→Port Trigger

”, and then you can configure the port trigger rules in the

screen as shown in Figure 4-29.

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Port trigger is used to restrict certain types of data packets from your local network to Internet. Some

applications require multiple connections, like Internet games, video conferencing, Internet calling and

so on. These applications cannot work with a pure NAT Router. Port Trigger is used for some of these

applications that can work with an NAT Router, which can be helpful in securing and restricting your

local network.

Figure 4-29



Nat Port rigger:

Enable or disable the port trigger function on the device. After selecting, click

the

Apply Changes

button to save your configuration.



Application Type:

You can select the service from the “

Usual Application Name

” and then

the following parameters, Match Port, Trigger Protocol, Relate Port and Open Protocol, will be

automatically filled. You can also de

fine the application by yourself in the “

User-defined

Application Name

” field. But, you need to fill the following related parameters manually.



Start Match Port / End Match port:

The start and end port to match.



Trigger Protocol:

The protocol to trigger the rule, it can be TCP, UDP or TCP/UDP.



Start Relate Port / End Relate Port:

The start and end related port.

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

Open Protocol:

It can be TCP, UDP or TCP/UDP.



NAT Type:

It can be outgoing or incoming.

Click the

Apply Changes

button to save your configuration. And then the trigger rule will be added

to the Current Portrigger Table.



Note:

After configuration, you need to click the

Save

button appeared on the left panel so that your

configuration can still take effect after the Router reboots.

4.3.2.5. IP Address Mapping

Choose “

Advanced→NAT→IP Address Mapping

”, and then you can configure the mapping rules

in the screen as shown in Figure 4-30.

NAT IP mapping allows you to configure one IP pool for specified source IP address from LAN, so a

packet whose source IP is in range of the specified address will select one IP address from pool for

NAT.

Figure 4-30



Type:

There are four types of mapping rule, “One

-to-

One”, “Many

-to-

One”, “Many

-to-

Many” and

“One

-to-

Many”.



One-to-One:

One local IP will be mapped to one global IP.



Many-to-One:

The IP between “Local Start IP” and “Local End IP” will be mapped to a

global IP.



Many-to-Many:

The IP between “Local Start IP” and “Local End IP” will

be mapped to the

IP between “Global Start IP” and “Global End IP”.



One-to-Many:

One local IP will be mapped to any of the IP between “Global Start IP” and

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“Global End IP”.



Local Start IP / Local 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.



Global Start IP / Global End IP:

Enter the global IP Address you want to do NAT. Global Start

IP is the starting public IP address and Global End IP is the ending public IP address. If you

have a dynamic IP, enter 0.0.0.0 as the Global Start IP.



Current NAT IP MAPPING Table:

This displays the information about the Mapping address.



Note:

After configuration, you need to click the

Save

button appeared on the left panel so that your

configuration can still take effect after the Router reboots.

4.3.3. QoS

Choose “

Advanced

→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.

Figure 4-31



IP QoS:

Choose “enable”, and then you will see the following parameters.

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

QoS Policy:

Policy of QoS. The traffic will be classified on the base of this policy. It can be

based on stream, 802.1p or DSCP. For detail instruction, please refer to

4.3.3.1 Stream

,

4.3.3.2

802.1p

and

4.3.3.3 DSCP

.



Schedule Mode:

The schedule mode of the IP QoS function, it can be “strict prior” or “WF

Q

(4:3:2:1)”.



Strict prior:

Traffic with different priority will be send by its priority, the higher priority the

traffic is, the higher priority the traffic will be send out.



WFQ (4:3:2:1):

Traffic with different priority will be send in proportion of its priority, the four

priority traffic will be send out in proportion to 4:3:2:1.



Apply:

Click this button to save your changes.



Note:

After configuration, you need to click the

Save

button appeared on the left panel so that your

configuration can still take effect after the Router reboots.

4.3.3.1. Stream

If the QoS policy is “stream based”, you should configure the QoS rule. To add a QoS rule, you need

to click the

add rule

button, and then some corresponding parameters will appear as shown in

Figure

4-32

.