ZyXEL P-2302R Manuel d'utilisateur télécharger pdf (Page 139)

P-2302R Series User’s Guide

Chapter 12 Network Address Translation (NAT) Screens 138

12.6 Trigger Port Forwarding

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 Prestige 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 Prestige's WAN port receives a response with a specific

port number and protocol ("incoming" port), the Prestige 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.

12.6.1 Trigger Port Forwarding Example

The following is an example of trigger port forwarding.

Local End IP This is the end Inside Local IP Address (ILA). If your rule is for all local IP

addresses, then enter 0.0.0.0 as the Local Start IP address and

255.255.255.255 as the Local End IP address.

This field is N/A for One-to-One and Server mapping types.

Global Start IP This is the starting Inside 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 Inside Global IP Address (IGA). This field is N/A for One-to-

One, Many-to-One and Server mapping types.

Apply Click Apply to save your changes back to the Prestige.

Cancel Click Cancel to return to the previous screen and not save your changes.

Table 37 Address Mapping Edit

LABEL DESCRIPTION

1 2 ... 134 135 136 137 138 139 140 141 142 143 144 ... 383 384

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ZyXEL P-2302R Manuel d'utilisateur Page 139