ZyXEL NBG6503 Manuel d'utilisateur télécharger pdf (Page 120)

Chapter 14 Network Address Translation (NAT)

NBG6503 User’s Guide

120

14.5 NAT Advanced Screen

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 Router 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

Router's WAN port receives a response with a specific port number and protocol ("incoming" port),

the Router 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.

To change your Router’s trigger port settings, click Network > NAT > Advanced. The screen

appears as shown.

Application Rules Summary

# This is the number of an individual port forwarding server entry.

Active This icon is turned on when the rule is enabled.

Name This field displays a name to identify this rule.

Port This field displays the port number(s).

Server IP

Address

This field displays the inside IP address of the server.

Modify Click the Edit icon to display and modify an existing rule setting in the fields under Add

Application Rule.

Click the Remove icon to delete a rule.

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

Reset Click Reset to begin configuring this screen afresh.

Table 51 Network > NAT > Application (continued)

LABEL DESCRIPTION

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ZyXEL NBG6503 Manuel d'utilisateur Page 120