Avaya Business Secure Router 252 Configuration - Basics Manuel d'utilisateur télécharger pdf (Page 144)

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144 Chapter 8 Network Address Translation (NAT) Screens

NN47923-500

Figure 40 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 Business Secure Router to record

Jane’s computer IP address. The Business Secure Router 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 Business Secure Router 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 Business Secure Router times out in three minutes with

UDP (User Datagram Protocol) or two hours with TCP/IP (Transfer Control

Protocol/Internet Protocol).

Two points to remember about Trigger Ports

Trigger events only happen on data that is coming from inside the Business

Secure Router and going to the outside.

If an application needs a continuous data stream, that port (range) is tied up so that

another computer on the LAN cannot trigger it.

Business Secure Router

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Avaya Business Secure Router 252 Configuration - Basics Manuel d'utilisateur Page 144

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