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Page 161 / 404 Scroll up to view Page 156 - 160
Chapter 10 Network Address Translation (NAT)
VMG8324-B10A / VMG8324-B30A Series User’s Guide
161
10.3
The Applications Screen
This screen provides a summary of all NAT applications and their configuration. In addition, this
screen allows you to create new applications and/or remove existing ones.
To access this screen, click
Network Setting > NAT > Applications
. The following screen
appears.
Figure 85
Network Setting > NAT > Applications
The following table describes the labels in this screen.
End Port
Enter the last port of the original destination port range.
To forward only one port, enter the port number in the
Start
Port
field above and then
enter it again in this field.
To forward a series of ports, enter the last port number in a series that begins with the port
number in the
Start Port
field above.
Translation
Start Port
This shows the port number to which you want the Device to translate the incoming port.
For a range of ports, enter the first number of the range to which you want the incoming
ports translated.
Translation End
Port
This shows the last port of the translated port range.
Server IP
Address
Enter the inside IP address of the virtual server here.
Protocol
Select the protocol supported by this virtual server. Choices are
TCP
,
UDP
, or
TCP/UDP
.
OK
Click
OK
to save your changes.
Cancel
Click
Cancel
to exit this screen without saving.
Table 58
Port Forwarding: Add/Edit (continued)
LABEL
DESCRIPTION
Table 59
Network Setting > NAT > Applications
LABEL
DESCRIPTION
Add new
application
Click this to add a new NAT application rule.
Application
Forwarded
This field shows the type of application that the service forwards.
WAN Interface
This field shows the WAN interface through which the service is forwarded.
Server IP
Address
This field displays the destination IP address for the service.
Modify
Click the
Delete
icon to delete the rule.
Page 162 / 404
Chapter 10 Network Address Translation (NAT)
VMG8324-B10A / VMG8324-B30A Series User’s Guide
162
10.3.1
Add New Application
This screen lets you create new NAT application rules. Click
Add new application
in the
Applications
screen to open the following screen.
Figure 86
Applications: Add
The following table describes the labels in this screen.
10.4
The Port Triggering Screen
Some services use a dedicated range of ports on the client side and a dedicated range of ports on
the server side. With regular port forwarding you set a forwarding port in NAT to forward a service
(coming in from the server on the WAN) to the IP address of a computer on the client side (LAN).
The problem is that port forwarding only forwards a service to a single LAN IP address. In order to
use the same service on a different LAN computer, you have to manually replace the LAN
computer's IP address in the forwarding port with another LAN computer's IP address.
Trigger port forwarding solves this problem by allowing computers on the LAN to dynamically take
turns using the service. The Device records the IP address of a LAN computer that sends traffic to
the WAN to request a service with a specific port number and protocol (a "trigger" port). When the
Device's WAN port receives a response with a specific port number and protocol ("open" port), the
Device forwards the traffic to the LAN IP address of the computer that sent the request. After that
computer’s connection for that service closes, another computer on the LAN can use the service in
the same manner. This way you do not need to configure a new IP address each time you want a
different LAN computer to use the application.
Table 60
Applications: Add
LABEL
DESCRIPTION
WAN Interface
Select the WAN interface that you want to apply this NAT rule to.
Server IP
Address
Enter the inside IP address of the application here.
Application
Category
Select the category of the application from the drop-down list box.
Application
Forwarded
Select a service from the drop-down list box and the Device automatically configures the
protocol, start, end, and map port number that define the service.
View Rule
Click this to display the configuration of the service that you have chosen in
Application
Fowarded
.
OK
Click
OK
to save your changes.
Cancel
Click
Cancel
to exit this screen without saving.
Page 163 / 404
Chapter 10 Network Address Translation (NAT)
VMG8324-B10A / VMG8324-B30A Series User’s Guide
163
For example:
Figure 87
Trigger Port Forwarding Process: Example
1
Jane requests a file from the Real Audio server (port 7070).
2
Port 7070 is a “trigger” port and causes the Device to record Jane’s computer IP address. The
Device associates Jane's computer IP address with the "open" port range of 6970-7170.
3
The Real Audio server responds using a port number ranging between 6970-7170.
4
The Device forwards the traffic to Jane’s computer IP address.
5
Only Jane can connect to the Real Audio server until the connection is closed or times out. The
Device times out in three minutes with UDP (User Datagram Protocol) or two hours with TCP/IP
(Transfer Control Protocol/Internet Protocol).
Click
Network Setting > NAT > Port Triggering
to open the following screen. Use this screen to
view your Device’s trigger port settings.
Figure 88
Network Setting > NAT > Port Triggering
The following table describes the labels in this screen.
Table 61
Network Setting > NAT > Port Triggering
LABEL
DESCRIPTION
Add new rule
Click this to create a new rule.
#
This is the index number of the entry.
Status
This field displays whether the port triggering rule is active or not. A yellow bulb signifies
that this rule is active. A gray bulb signifies that this rule is not active.
Service Name
This field displays the name of the service used by this rule.
WAN Interface
This field shows the WAN interface through which the service is forwarded.
Trigger Start
Port
The trigger port is a port (or a range of ports) that causes (or triggers) the Device to record
the IP address of the LAN computer that sent the traffic to a server on the WAN.
This is the first port number that identifies a service.
Trigger End
Port
This is the last port number that identifies a service.
Trigger Proto.
This is the trigger transport layer protocol.
Page 164 / 404
Chapter 10 Network Address Translation (NAT)
VMG8324-B10A / VMG8324-B30A Series User’s Guide
164
10.4.1
Add/Edit Port Triggering Rule
This screen lets you create new port triggering rules. Click
Add new rule
in the
Port Triggering
screen or click a rule’s
Edit
icon to open the following screen.
Figure 89
Port Triggering: Add/Edit
The following table describes the labels in this screen.
Open Start Port
The open port is a port (or a range of ports) that a server on the WAN uses when it sends
out a particular service. The Device forwards the traffic with this port (or range of ports) to
the client computer on the LAN that requested the service.
This is the first port number that identifies a service.
Open End Port
This is the last port number that identifies a service.
Open Proto.
This is the open transport layer protocol.
Modify
Click the
Edit
icon to edit this rule.
Click the
Delete
icon to delete an existing rule.
Table 61
Network Setting > NAT > Port Triggering (continued)
LABEL
DESCRIPTION
Table 62
Port Triggering: Configuration Add/Edit
LABEL
DESCRIPTION
Active
Select the check box to enable this rule.
Service Name
Enter a name to identify this rule using keyboard characters (A-Z, a-z, 1-2 and so on).
WAN Interface
Select a WAN interface for which you want to configure port triggering rules.
Trigger Start
Port
The trigger port is a port (or a range of ports) that causes (or triggers) the Device to record
the IP address of the LAN computer that sent the traffic to a server on the WAN.
Type a port number or the starting port number in a range of port numbers.
Trigger End
Port
Type a port number or the ending port number in a range of port numbers.
Trigger Protocol
Select the transport layer protocol from
TCP
,
UDP
, or
TCP/UDP
.
Page 165 / 404
Chapter 10 Network Address Translation (NAT)
VMG8324-B10A / VMG8324-B30A Series User’s Guide
165
10.5
The DMZ Screen
In addition to the servers for specified services, NAT supports a default server IP address. A default
server receives packets from ports that are not specified in the
NAT Port Forwarding Setup
screen.
Figure 90
Network Setting > NAT > DMZ
The following table describes the fields in this screen.
Open Start Port
The open port is a port (or a range of ports) that a server on the WAN uses when it sends
out a particular service. The Device forwards the traffic with this port (or range of ports) to
the client computer on the LAN that requested the service.
Type a port number or the starting port number in a range of port numbers.
Open End Port
Type a port number or the ending port number in a range of port numbers.
Open Protocol
Select the transport layer protocol from
TCP
,
UDP
, or
TCP/UDP
.
OK
Click
OK
to save your changes.
Cancel
Click
Cancel
to exit this screen without saving.
Table 62
Port Triggering: Configuration Add/Edit (continued)
LABEL
DESCRIPTION
Table 63
Network Setting > NAT > DMZ
LABEL
DESCRIPTION
Default Server
Address
Enter the IP address of the default server which receives packets from ports that are not
specified in the
NAT Port Forwarding
screen.
Note: If you do not assign a
Default Server Address
, the Device discards all packets
received for ports that are not specified in the
NAT Port Forwarding
screen.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to restore your previously saved settings.

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