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Figure 4-23 NAT Setup

The following items are displayed on this screen:

¾

NAPT

Source Port Range:

Enter the source port range between 2049 and 65000, the span of which

must be not less than 100.

¾

NAT-DMZ

NAT-DMZ:

Enable or disable NAT-DMZ. NAT DMZ is a special service of NAT

application, which can be considered as a default forwarding rule. When

NAT DMZ (Pseudo DMZ) is enabled, all the data initiated by external

network falling short of the current connections or forwarding rules will be

forwarded to the preset NAT DMZ host.

Host IP Address:

Enter the IP address of the host specified as NAT DMZ server.

4.5.1.2

Virtual Server

Virtual server can be used for setting up public services in your private network, such as DNS, Email

and FTP. Virtual server can define a service port. All the service requests to this port will be transmitted

to the LAN server appointed by the Router via IP address.

Choose the menu

Advanced

→

NAT

→

Virtual

Server

to load the following page.

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Figure 4-24 Virtual Server

The following items are displayed on this screen:

¾

Virtual Server

Name:

Enter a name for Virtual Server entries. Up to 28 characters can be

entered.

External Port:

Enter the service port or port range provided by Router for accessing

external network. All requests from Internet to this service port or port

range will be redirected to the specified server in local network.

Internal Port:

Specify the service port of the LAN host as virtual server.

Protocol:

Specify the protocol used for the entry.

Internal Server IP:

Enter the IP address of the specified internal server for the entry. All

the requests from the Internet to the specified LAN port will be

redirected to this host.

Status:

Activate or inactivate the entry.

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Note:

●

The External port and Internal Port should be set in the range of 1-65535.

●

The external ports of different entries should be different, whereas the internal ports can be the

same.

¾

List of Rules

In this table, you can view the information of the entries and edit them by the Action buttons.

The first entry in Figure 4-24 indicates: This is a Virtual Server entry named host1, all the TCP data

packets from Internet to port 65534-65535 of the Router will be redirected to the port 65534-65535 of

the LAN host with IP address of 192.168.0.103, and this entry is activated.

4.5.1.3

Port Triggering

Some applications require multiple connections, like Internet games, video conferencing, Internet

calling, P2P download and so on. Port Triggering is used for those applications requiring multiple

connections.

When an application initiates a connection to the trigger port, all the ports corresponding to the

incoming port will open for follow-up connections.

Choose the menu

Advanced

→

NAT

→

Port Triggering

to load the following page.

Figure 4-25 Port Triggering

The following items are displayed on this screen:

-55-

¾

Port Triggering

Name:

Enter a name for Port Triggering entries. Up to 28 characters can be

entered.

Trigger Port:

Enter the trigger port number or range of port numbers. Only when the

trigger port initiates connection will all the corresponding incoming

ports open and provide service for the applications, otherwise the

incoming ports will not open.

Trigger Protocol:

Select the protocol used for trigger port.

Incoming Port:

Enter the incoming port number or range of port numbers. The

incoming port will open for follow-up connection after the trigger port

initiates connection.

Incoming Protocol:

Select the protocol used for incoming port.

Status:

Activate or inactivate the entry.

Note:

●

The Trigger Port and Incoming Port should be set in the range of 1-65535. The Incoming Port can

be set in a continuous range such as 8690-8696.

●

The Router supports up to 16 Port Triggering entries. Each entry supports at most 5 groups of

trigger ports and overlapping between the ports is not allowed.

●

Each entry supports at most 5 groups of incoming ports and the sum of incoming ports you set for

each entry should not be more than 100.

¾

List of Rules

In this table, you can view the information of the entries and edit them by the Action buttons.

The first entry in Figure 4-25 indicates that: This is a Port Triggering entry named host1, When the LAN

host initiates a TCP request via port of 5354, the incoming port 5355 will open for TCP and UDP

protocol. This entry is activated.

4.5.1.4

ALG

Some special protocols such as FTP, H.323, SIP, IPsec and PPTP will work properly only when ALG

(Application Layer Gateway) service is enabled.

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Choose the menu

Advanced

→

NAT

→

ALG

to load the following page.

Figure 4-26 ALG

The following items are displayed on this screen:

¾

ALG

FTP ALG:

Enable or disable FTP ALG. The default setting is enabled. It is

recommended to keep the default setting if no special

requirement.

H.323 ALG:

Enable or disable H.323 ALG. The default setting is enabled.

H.323 is used for various applications such as NetMeeting and

VoIP.

SIP ALG:

Enable or disable SIP ALG. The default setting is enabled. It is

recommended to keep the default setting if no special

requirement.

IPsec ALG:

Enable or disable IPsec ALG. The default setting is enabled. It is

recommended to keep default if no special requirement.

PPTP ALG:

Enable or disable PPTP ALG. The default setting is enabled. It is

recommended to keep default if no special requirement.

4.5.2 Traffic Control

Traffic Control functions to control the bandwidth by configuring rules for limiting various data flows. In

this way, the network bandwidth can be reasonably distributed and utilized.

4.5.2.1

Setup

Choose the menu

Advanced

→

Traffic Control

→

Setup

to load the following page.