ZyXEL Communications MAX-207HW2, Руководство пользователя

Страница: 93 / 180

Chapter 8 The NAT Configuration Screens
User’s Guide
94
8.4 Trigger Port
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 WiMAX Modem 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 WiMAX Modem's
WAN port receives a response with a specific port number and protocol
("incoming" port), the WiMAX Modem 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.
Start Port
End Port
Enter the port number or range of port numbers you want to forward to
the specified server.
To forward one port number, enter the port number in the Start Port
and End Port fields.
To forward a range of ports,
• enter the port number at the beginning of the range in the Start
Port field
• enter the port number at the end of the range in the End Port field.
Server IP
Address Enter the IP address of the server to which to forward packets for the
selected port number(s). This server is usually on the LAN.
Apply (
套用
) Click to save your changes.
Cancel (
取消
) Click to return to the previous screen without saving your changes.
Table 32 ADVANCED (
進階
) > NAT Configuration (NAT
設定
) > Port Forwarding >
Rule Setup (continued)
LABEL DESCRIPTION