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Page 86 / 160 Scroll up to view Page 81 - 85
Chapter 12
Network Address Translation (NAT)
86
12.2.1
The Port Forwarding Screen
Click
Network Setting > NAT
to open the
Port Forwarding
screen.
Figure 42
Network Setting > NAT > Port Forwarding
Table 40
Network Setting > NAT > Port Forwarding
LABEL
DESCRIPTION
WAN Interface
Select the WAN interface for which to configure NAT port forwarding rules.
Add new rule
Click this to add a new port forwarding rule.
Active
This field indicates whether the 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 is the service’s name. This shows
User Defined
if you manually added a service.
You can change this by clicking the edit icon.
External Start/End
Port
This is the first/last external port number that identifies a service.
Internal Start/End
Port
This is the first/last internal port number that identifies a service.
Server IP Address
This is the server’s IP address.
Modify
Click the
Edit
icon to edit the port forwarding rule.
Click the
Delete
icon to delete an existing port forwarding rule. Note that subsequent
address mapping rules move up by one when you take this action.
Page 87 / 160
Chapter 12
Network Address Translation (NAT)
87
12.2.2
The Port Forwarding Add/Edit Screen
This screen lets you create or edit a port forwarding rule. Click
Add new rule
in the
Port
Forwarding
screen or the
Edit
icon next to an existing rule.
Figure 43
NAT > Port Forwarding: Add/Edit
Table 41
NAT > Port Forwarding: Add/Edit
LABEL
DESCRIPTION
Active
Select or clear this field to turn the port forwarding rule on or off.
Service Name
Select a service to forward or select
User Defined
and enter a name in the field to the
right.
External Start
Port
Configure this for a user-defined entry. Enter the original destination port for the
packets.
To forward only one port, enter the port number again in the
External End Port
field.
To forward a series of ports, enter the start port number here and the end port number
in the
External End Port
field.
External End Port
Configure this for a user-defined entry. Enter the last port of the original destination
port range.
To forward only one port, enter the port number in the
External 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
External Start Port
field above.
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
.
Page 88 / 160
Chapter 12
Network Address Translation (NAT)
88
12.3
The Address Mapping Screen
Ordering your rules is important because the Router applies the rules in the order that you specify.
When a rule matches the current packet, the Router takes the corresponding action and the
remaining rules are ignored.
This screen is avaliable only when you select
NAT Full Feature on
in the
General
screen. To change
your Router’s address mapping settings, click
Network Setting > NAT > Address Mapping
.
Network Se ting > NAT > Addre
s Mapping
Table 42
Network > NAT > Address Mapping
LABEL
DESCRIPTION
Add new rule
Click this to add a new address mapping rule.
Mapping Set
This is the index number of the address mapping set.
Local Start IP
This is the starting Inside Local IP Address (ILA).
Local End IP
This is the end Inside Local IP Address (ILA).
Global Start IP
This is the starting Inside Global IP Address (IGA).
Global End IP
This is the ending Inside Global IP Address (IGA).
Type
This is the port mapping type.
Modify
Click the edit icon to go to the screen where you can edit the address mapping rule.
Click the delete icon to delete an existing address mapping rule. Note that subsequent
address mapping rules move up by one when you take this action.
Open Start Port
Configure this for a user-defined entry. This shows the port number to which you want
the Router 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.
Open End Port
Configure this for a user-defined entry. This shows the last port of the translated port
range.
Table 41
NAT > Port Forwarding: Add/Edit (continued)
LABEL
DESCRIPTION
Page 89 / 160
Chapter 12
Network Address Translation (NAT)
89
12.3.1
The Address Mapping Rule Edit Screen
Use this screen to edit an address mapping rule. Click the rule’s edit icon in the
Address Mapping
screen to display the screen shown next.
Figure 44
NAT > Address Mapping: Edit
Figure 45
NAT > Address Mapping: Edit
LABEL
DESCRIPTION
Type
Choose the port mapping type from one of the following.
One-to-One:
maps one local IP address to one global IP address. Note that port
numbers do not change for One-to-one NAT mapping type.
Many-to-One:
maps multiple local IP addresses to one global IP address.
Many-to-Many:
maps multiple local IP addresses to shared global IP addresses.
One-to-Many (Server):
allows you to specify inside servers of different services
behind the NAT to be accessible to the outside world.
Local Start IP
Enter the starting local IP address (ILA).
Local End IP
Enter the ending local IP address (ILA).
Global Start IP
Enter the starting global IP address (IGA). Enter 0.0.0.0 here if you have a dynamic IP
address from your ISP.
Global End IP
This is the ending global IP address (IGA).
Mapping Set
Select the index number of the address mapping set.
Page 90 / 160
Chapter 12
Network Address Translation (NAT)
90
12.4
The DMZ Screen
Click
Network Setting > NAT > DMZ
to open the
DMZ
screen. Use this screen to specify the IP
address of a default server to receive packets from ports not specified in the
Port Forwarding
screen.
Figure 46
Network Setting > NAT > DMZ
Table 43
Network Setting > NAT > DMZ
LABEL
DESCRIPTION
WAN Interface
Select the WAN interface for which to configure a default server.
Default Server
Address
Enter the IP address of the default server which receives packets from ports that are not
specified in the
Port Forwarding
screen.
Note: If you do not assign a default server, the Router discards all packets received for
ports not specified in the virtual server configuration.
12.5
The ALG Screen
Click
Network Setting > NAT > ALG
to open the
ALG
screen. Use this screen to enable and disable
the NAT Application Layer Gateway (ALG) in the Router.

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