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Page 86 / 300 Scroll up to view Page 81 - 85
Chapter 7 Network Address Translation (NAT) Screens
P-663HN-51 User’s Guide
86
7.3.1
Virtual Server Rule Add
To create a virtual server rule, click
Advanced Setup > NAT > Virtual Servers
> Add
to open the following screen.
Figure 37
Advanced Setup > NAT > Virtual Servers > Add
The following table describes the fields in this screen.
Table 24
Advanced Setup > NAT > Virtual Servers > Add
LABEL
DESCRIPTION
Server Name
Either select a pre-defined service or select
Custom Server
and enter a
name manually.
Server IP
Address
Enter the LAN IP address to which the ZyXEL Device should forward the
traffic.
Save/Apply
When using a pre-defined service, if you do not want to modify the port
numbers, you can click this button to save the changes and have the
ZyXEL Device start using them.
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87
7.4
Port Triggering
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 ZyXEL 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 ZyXEL Device's
WAN port receives a response with a specific port number and protocol
("incoming" port), the ZyXEL 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.
External Port
Start
Enter a port number in this field.
To forward only one port, enter the port number again in the
External
Port End
field.
To forward a series of ports, enter the start port number here and the end
port number in the
External Port End
field.
External Port
End
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.
Protocol
This is the underlying protocol of the traffic to which this virtual server
entry applies.
Internal Port
Start
Specify the starting port the ZyXEL Device uses for the traffic that it
forwards based on this virtual server entry (or leave it the same as the
External
Internal Port
End
The ZyXEL Device automatically determines this port number.
Save/Apply
Click this button to save the changes and have the ZyXEL Device start
using them.
Table 24
Advanced Setup > NAT > Virtual Servers > Add
(continued)
LABEL
DESCRIPTION
Page 88 / 300
Chapter 7 Network Address Translation (NAT) Screens
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For example:
Figure 38
Trigger Port Forwarding Process: Example
1
Jane (A) requests a file from the Real Audio server (port 7070).
2
Port 7070 is a “trigger” port and causes the ZyXEL Device to record Jane’s
computer IP address. The ZyXEL Device associates Jane's computer IP address
with the "incoming" port range of 6970-7170.
3
The Real Audio server responds using a port number ranging between 6970-7170.
4
The ZyXEL 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 ZyXEL Device times out in three minutes with UDP (User Datagram
Protocol) or two hours with TCP/IP (Transfer Control Protocol/Internet Protocol).
Click
Advanced Setup > NAT
>
Port Triggering
to open the following screen.
Use this screen to change your ZyXEL Device’s trigger port settings.
Figure 39
Advanced Setup > NAT > Port Triggering
Page 89 / 300
Chapter 7 Network Address Translation (NAT) Screens
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89
The following table describes the labels in this screen.
7.5
Port Triggering Add
Click
Advanced Setup > NAT
>
Port Triggering > Add
to open the following
screen. Use this screen to change your ZyXEL Device’s trigger port settings.
Figure 40
Advanced Setup > NAT > Port Triggering > Add
Table 25
Advanced Setup > NAT > Port Triggering
LABEL
DESCRIPTION
Add
Click this button to go to a screen where you can configure a new entry.
Remove
To remove an entry(ies), select its
Remove
check box and click the
Remove
button.
Application
Name for identification purposes.
Trigger
The trigger port is a protocol and port (or a range of ports) that causes (or
triggers) the ZyXEL Device to record the IP address of the LAN computer
that sent the traffic to a server on the WAN.
Open
Open is a port (or a range of ports) that a server on the WAN uses when it
sends out a particular service. The ZyXEL Device forwards the traffic with
this port (or range of ports) to the client computer on the LAN that
requested the service.
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The following table describes the labels in this screen.
7.6
DMZ Host
In addition to the virtual servers for specified services, NAT supports a DMZ host
IP address. The DMZ host receives packets from ports that are not specified in the
applications in the virtual server configuration.
Note: If you do not assign a DMZ host IP address, the ZyXEL Device discards all
packets received for ports that are not specified here or in the remote
management setup.
Table 26
Advanced Setup > NAT > Port Triggering > Add
LABEL
DESCRIPTION
Application
Name
Either select a pre-defined application or select
Custom Application
and
enter a name manually.
Save/Apply
When using a pre-defined service, if you do not want to modify the port
numbers, you can click this button to save the changes and have the ZyXEL
Device start using them.
Trigger
The trigger port is a protocol and port (or a range of ports) that causes (or
triggers) the ZyXEL Device to record the IP address of the LAN computer
that sent the traffic to a server on the WAN.
Trigger
Port
Start
Type a port number or the starting port number in a range of port numbers.
Trigger
Port End
Type a port number or the ending port number in a range of port numbers.
Trigger
Protocol
Select the protocol.
Open
Open is a port (or a range of ports) that a server on the WAN uses when it
sends out a particular service. The ZyXEL Device forwards the traffic with
this port (or range of ports) to the client computer on the LAN that
requested the service.
Open
Start
Port
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 protocol.
Save/Apply
Click this button to save the changes and have the ZyXEL Device start using
them.

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