ZTE ZXDSL 931VII Netvigator Router Manual PDF (Setup & Configuration Guide)

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Chapter 8 NAT Conﬁguration

F

IGURE

112 V

IRTUAL

S

ERVER

However, you may want to expose your network to the Internet in

limited and controlled ways in order to enable some applications

to work from the

LAN

(for example, game, voice, and chat ap-

plications) and to enable Internet access to servers in the home

network. The port forwarding feature supports both functionality.

This topic is also referred to as Local Servers.

The port forwarding page is used to deﬁne applications that require

special handling by the 931WII. All you need to do is to select the

application protocol and the local IP address of the computer that

is using or providing the service. You can also add new protocols,

besides the most common ones provided by the 931WII.

For example, if you want to use a File Transfer Protocol (

FTP

) appli-

cation on one of your PCs, simply select FTP from the list and enter

the local IP address or host name of the designated computer. All

FTP-related data arriving at the 931WII from the Internet hence-

forth is forwarded to the speciﬁc computer.

Similarly, you can grant Internet users access to servers inside

your home network, by identifying each service and the PC that

provides it. This is useful, for example, if you want to host a Web

server inside your home network.

When an Internet user points his/her browser to 931WII external

IP address, the gateway forwards the incoming

HTTP

request to

your web server. With one external IP address (the 931WII main

IP address), different applications can be assigned to your LAN

computers, however, each type of application is limited to use one

computer.

For example, you can deﬁne that FTP uses address X to reach com-

puter A and Telnet also uses address X to reach computer A. But

attempting to deﬁne FTP to use address X to reach both computer

A and B fails. The 931WII, therefore, provides the ability to add

additional public IP addresses to port forwarding rules, which you

must obtain from your ISP, and enter into the IP addresses pool.

Then, you can deﬁne FTP to use address X to reach computer A

and address Y to reach computer B.

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ZXDSL 931WII Operation manual

Additionally, port forwarding enables you to redirect trafﬁc to a

different port instead of the one to which it was designated. For

example, if you have a Web server running on your PC on port

8080 and you want to grant access to this server to any one who

accesses the 931WII via HTTP, do as follows:

1.

Deﬁne a port forwarding rule for the HTTP service, with the PC

IP or host name.

2.

Specify 8080 in the Forward to Port’ ﬁeld.

All incoming HTTP trafﬁc is forwarded to the PC running the web

server on port 8080. When setting a port forwarding service, en-

sure that the port is not already used by another application, which

may stop functioning. A common example is when using SIP sig-

naling in Voice over IP, the port used by the gateway VoIP appli-

cation (5060) is the same port on which port forwarding is set for

LAN SIP agents.

Note:

Some applications, such as FTP, TFTP, PPTP, and H323, require the

support of special speciﬁc ALG modules in order to work inside the

home network.

Data packets associated with these applications

contain information that allows them to be routed correctly.

An

ALG is needed to handle these packets and ensure that they reach

their intended destinations. The 931WII is equipped with a robust

list of ALG modules in order to enable maximum functionality in

the home network.

The ALG is automatically assigned based on

the destination port.

Adding Port

Forwarding

1.

Select

Advanced Setup > NAT > Virtual Servers

to display

the interface as shown in

F

i

g

u

r

e

1

3

.

F

IGURE

113 V

IRTUAL

S

ERVERS

O

VERVIEW

2.

Click

Add

to display the interface as shown in

F

i

g

u

r

e

1

4

.

86

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Chapter 8 NAT Conﬁguration

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IGURE

114 A

DDING

V

IRTUAL

S

ERVERS

3.

Select the dedicated WAN interface to be

Use Interface

.

4.

Select a service or enter a custom server.

5.

Enter the

Server IP Address

of the computer that provides

the service (the server in the Local Host ﬁeld).

Note:

Note that unless an additional external IP address is added,

only one LAN computer can be assigned to provide a speciﬁc

service or application.

6.

Set External Port Start and External Port End.

7.

Select Protocol.

8.

Set Internal Port Start and Internal Port End.

9.

Click

Save/Apply

to

save

the

conﬁguration

so

that

the

changes can take effect.

Deleting Port

Forwarding

Select the

Remove

check box in the table and click

Remove

to

apply the settings.

Port Triggering

If you conﬁgure port triggering for a certain application, you need

to determine a trigger port and the protocol (

TCP

or

UDP

) that this

port uses. You then assign the public ports that are to be opened

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ZXDSL 931WII Operation manual

for the application to this trigger port. You can select known In-

ternet services or assign ports or port blocks manually.

Add

port

Triggering

1.

Select

Advanced Setup > NAT > Port Triggering

to display

the interface as shown in

F

i

g

u

r

e

1

5

.

F

IGURE

115 P

ORT

T

RIGGERING

O

VERVIEW

2.

Click

Add

to display the interface as shown in

F

i

g

u

r

e

1

6

.

F

IGURE

116 A

DDING

P

ORT

T

RIGGERING

3.

Select the dedicated WAN interface to be

Use Interface

.

4.

Select the required application from the

Select One Applica-

tion

drop-down list.

5.

You can also manually enter the information in the

Custom

application

ﬁeld.

6.

T

a

b

l

e

1

7

is a description of the different options.

88

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Chapter 8 NAT Conﬁguration

T

ABLE

17 C

USTOM

P

ORT

T

RIGGERING

C

ONFIGURATION

O

PTIONS

Field

Description

Trigger Port Start/Trigger Port

End

Enter the port that is to be

monitored for outgoing data

trafﬁc.

Trigger Protocol

Select the protocol that is to

be monitored for outgoing data

trafﬁc.

Open Protocol

Select the protocol that is to

be allowed for incoming data

trafﬁc.

Open Port Start and Open Port

End

Enter the port that is to be

opened for incoming trafﬁc.

Note:

You can use a single port number, several port numbers sepa-

rated by commas, port blocks consisting of two port numbers

separated by a dash, or any combina-tion of these, for exam-

ple 80, 90-140, 180.

7.

Click

Save/Apply

to

save

the

conﬁguration

so

that

the

changes can take effect.

Removing Port

Triggering

Select the

Remove

check box in the table and click

Remove

to

apply the settings.

DMZ Host

The

DMZ

host feature allows one local computer to be exposed to

the Internet. This function is applicable for:

�

Users who want to use the Internet service for a special pur-

pose, such as an online game or video conferencing program,

that is not present in the Port Forwarding list and for which no

port range information is available.

�

Users who are not concerned with security and wish to expose

one computer to all services without restriction.

Conﬁdential and Proprietary Information of ZTE CORPORATION

89

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