Avaya Business Secure Router 222 Configuration - Basics Bedienungsanleitung PDF herunterladen (Seite 145)

Chapter 8 Network Address Translation (NAT) Screens 145

Nortel Business Secure Router 222 Configuration — Basics

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 Business Secure 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 WAN port on

the Business Secure Router receives a response with a specific port number and

protocol (incoming port), the Business Secure 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.

Trigger Port Forwarding example

Figure 41 illustrates an example of trigger port forwarding.

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 to the Business Secure Router.

Reset Click Reset to begin configuring this screen afresh.

Table 31 Address Mapping edit

Label Description

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Avaya Business Secure Router 222 Configuration - Basics Bedienungsanleitung Seite 145