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Page 146 / 427 Scroll up to view Page 141 - 145
P-2602H(W)(L)-DxA Series User’s Guide
146
Chapter 10 Network Address Translation (NAT) Screens
You may enter a single port number or a range of port numbers to be forwarded, and the local
IP address of the desired server. The port number identifies a service; for example, web
service is on port 80 and FTP on port 21. In some cases, such as for unknown services or
where one server can support more than one service (for example both FTP and web service),
it might be better to specify a range of port numbers. You can allocate a server IP address that
corresponds to a port or a range of ports.
Many residential broadband ISP accounts do not allow you to run any server processes (such
as a Web or FTP server) from your location. Your ISP may periodically check for servers and
may suspend your account if it discovers any active services at your location. If you are
unsure, refer to your ISP.
10.4.1
Default Server IP Address
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 this screen.
Note:
If you do not assign a
Default Server
IP address, the ZyXEL Device discards
all packets received for ports that are not specified here or in the remote
management setup.
10.4.2
Port Forwarding: Services and Port Numbers
Use the
Port Forwarding
screen to forward incoming service requests to the server(s) on your
local network.
The most often used port numbers and services are shown in
Appendix F on page 371
. Please
refer to RFC 1700 for further information about port numbers.
10.4.3
Configuring Servers Behind Port Forwarding (Example)
Let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server (
A
in the
example), port 80 to another (
B
in the example) and assign a default server IP address of
192.168.1.35 to a third (
C
in the example). You assign the LAN IP addresses and the ISP
assigns the WAN IP address. The NAT network appears as a single host on the Internet.
Figure 80
Multiple Servers Behind NAT Example
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10.5
Configuring Port Forwarding
Note:
If you do not assign a
Default Server
IP address, the ZyXEL Device discards
all packets received for ports that are not specified here or in the remote
management setup.
Click
Network > NAT > Port Forwarding
to open the following screen.
See
Appendix F on page 371
for port numbers commonly used for particular services.
Figure 81
Port Forwarding
The following table describes the fields in this screen.
Table 49
Port Forwarding
LABEL
DESCRIPTION
Default Server
Setup
Default Server
In addition to the servers for specified services, NAT supports a default server. A
default server receives packets from ports that are not specified in this screen. If
you do not assign a
Default Server
IP address, the ZyXEL Device discards all
packets received for ports that are not specified here or in the remote management
setup.
Port Forwarding
Service Name
Select a service from the drop-down list box.
Server IP Address
Enter the IP address of the server for the specified service.
Add
Click this button to add a rule to the table below.
#
This is the rule index number (read-only).
Active
Click this check box to enable the rule.
Service Name
This is a service’s name.
Start Port
This is the first port number that identifies a service.
End Port
This is the last port number that identifies a service.
Server IP Address
This is the server’s IP address.
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Chapter 10 Network Address Translation (NAT) Screens
10.5.1
Port Forwarding Rule Edit
To edit a port forwarding rule, click the rule’s edit icon in the
Port Forwarding
screen to
display the screen shown next.
Figure 82
Port Forwarding Rule Setup
The following table describes the fields in this screen.
Modify
Click the edit icon to go to the screen where you can 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.
Apply
Click
Apply
to save your changes back to the ZyXEL Device.
Cancel
Click
Cancel
to return to the previous configuration.
Table 49
Port Forwarding
LABEL
DESCRIPTION
Table 50
Port Forwarding Rule Setup
LABEL
DESCRIPTION
Active
Click this check box to enable the rule.
Service Name
Enter a name to identify this port-forwarding rule.
Start Port
Enter a port number in this field.
To forward only one port, enter the port number again in the
End Port
field.
To forward a series of ports, enter the start port number here and the end port
number in the
End Port
field.
End Port
Enter a port number in this field.
To forward only one port, enter the port number again 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.
Server IP
Address
Enter the inside IP address of the server here.
Back
Click
Back
to return to the previous screen.
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10.5.2
SIP ALG
Some NAT routers may include a SIP Application Layer Gateway (ALG). A SIP ALG allows
SIP calls to pass through NAT by examining and translating IP addresses embedded in the
data stream. When the ZyXEL Device registers with the SIP register server, the SIP ALG
translates the ZyXEL Device’s private IP address inside the SIP data stream to a public IP
address. You do not need to use STUN or an outbound proxy if your ZyXEL Device is behind
a SIP ALG.
Use this screen to enable and disable the SIP (VoIP) ALG in the ZyXEL Device. To access
this screen, click
Network > NAT > ALG
.
Figure 83
Network > NAT > ALG
Each field is described in the following table.
Apply
Click
Apply
to save your changes back to the ZyXEL Device.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Table 50
Port Forwarding Rule Setup
(continued)
LABEL
DESCRIPTION
Table 51
Network > NAT > ALG
LABEL
DESCRIPTION
Enable SIP ALG
Select this to make sure SIP (VoIP) works correctly with port-forwarding and
address-mapping rules.
Apply
Click this to save your changes and to apply them to the ZyXEL Device.
Reset
Click this to return to previously saved configuration.
Page 150 / 427
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Chapter 10 Network Address Translation (NAT) Screens

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