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ZyXEL Communications Internet Security Gateway ZyWALL 100 User Manual

Page 140

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ZyWALL 100 Internet Security Gateway

NAT

12-27

3. The Real Audio server responds using a port number ranging between 6970-7170.
4. The ZyWALL associates this “incoming” port with the trigger port, remembers Jane’s computer IP

address and then forwards the traffic to her computer.

5. Only Jane can connect to the Real Audio server until the connection is closed or times out

1

.



1

The ZyWALL will time out in three minutes when using UDP (User Datagram Protocol) or two hours

when using TCP/IP (Transfer Control Protocol/Internet Protocol).