DrayTek Vigor-2920 Router Manual PDF (Setup & Configuration Guide)

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Vigor2920 Series User’s Guide

91

The port redirection can only apply to incoming traffic.

To use this function, please go to

NAT

page and choose

Port

Redirection

web page. The

Port Redirection Table

provides 20 port-mapping entries for the internal hosts.

Press any number under Index to access into next page for configuring port redirection.

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92

Enable

Check this box to enable such port redirection setting.

Mode

Two options (Single and Range) are provided here for you to choose.

To set a range for the specific service, select

Range

. In Range mode,

if the public port (start port and end port) and the starting IP of

private IP had been entered, the system will calculate and display the

ending IP of private IP automatically.

Service Name

Enter the description of the specific network service.

Protocol

Select the transport layer protocol (TCP or UDP).

WAN IP

Select the WAN IP used for port redirection. There are eight WAN

IP alias that can be selected and used for port redirection. The

default setting is

All

which means all the incoming data from any

port will be redirected to specified range of IP address and port.

Public Port

Specify which port can be redirected to the specified

Private IP and

Port

of the internal host. If you choose

Range

as the port redirection

mode, you will see two boxes on this field. Simply type the required

number on the first box. The second one will be assigned

automatically later.

Private IP

Specify the private IP address of the internal host providing the

service. If you choose

Range

as the port redirection mode, you will

see two boxes on this field. Type a complete IP address in the first

box (as the starting point) and the fourth digits in the second box (as

the end point).

Private Port

Specify the private port number of the service offered by the internal

host.

Note that the router has its own built-in services (servers) such as Telnet, HTTP and FTP etc.

Since the common port numbers of these services (servers) are all the same, you may need to

reset the router in order to avoid confliction.

For example, the built-in web configurator in the router is with default port 80, which may

conflict with the web server in the local network, http://192.168.1.13:80. Therefore, you need

to

change the router’s http port to

any one other than the default port 80

to avoid conflict,

such as 8080. This can be set in the

System Maintenance >>Management Setup

. You then

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Vigor2920 Series User’s Guide

93

will access the admin screen of by suffixing the IP address with 8080, e.g.,

http://192.168.1.1:8080 instead of port 80.

4.3.2 DMZ Host

As mentioned above,

Port Redirection

can redirect incoming TCP/UDP or other traffic on

particular ports to the specific private IP address/port of host in the LAN. However, other IP

protocols, for example Protocols 50 (ESP) and 51 (AH), do not travel on a fixed port. Vigor

router provides a facility

DMZ Host

that maps ALL unsolicited data on any protocol to a

single host in the LAN. Regular web surfing and other such Internet activities from other

clients will continue to work without inappropriate interruption.

DMZ Host

allows a defined

internal user to be totally exposed to the Internet, which usually helps some special

applications such as Netmeeting or Internet Games etc.

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Vigor2920 Series User’s Guide

94

The security properties of NAT are somewhat bypassed if you set up DMZ host. We suggest

you to add additional filter rules or a secondary firewall.

Click

DMZ Host

to open the following page:

If you previously have set up

WAN Alias

for

PPPoE

or

Static or Dynamic IP

mode

,

you will

find them in

Aux. WAN IP

for your selection.

Enable

Check to enable the DMZ Host function.

Private IP

Enter the private IP address of the DMZ host, or click Choose PC to

select one.

Choose PC

Click this button and then a window will automatically pop up, as

depicted below. The window consists of a list of private IP addresses

of all hosts in your LAN network. Select one private IP address in

the list to be the DMZ host.

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Vigor2920 Series User’s Guide

95

When you have selected one private IP from the above dialog, the IP

address will be shown on the following screen. Click

OK

to save the

setting.

4.3.3 Open Ports

Open Ports

allows you to open a range of

ports for the traffic of special applications.

Common application of Open Ports includes P2P application (e.g., BT, KaZaA, Gnutella,

WinMX, eMule and others), Internet Camera etc. Ensure that you keep the application

involved up-to-date to avoid falling victim to any security exploits.

Click

Open Ports

to open the following page:

Index

Indicate the relative number for the particular entry that you want to

offer service in a local host. You should click the appropriate index

number to edit or clear the corresponding entry.

Comment

Specify the name for the defined network service.

VoIPon

www.voipon.co.uk

[email protected]

Tel: +44 (0)1245 808195

Fax: +44 (0)1245 808299

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