ZyXEL Communications prestige 314 plus ユーザーズマニュアル

Prestige 314 PLUS Broadband Sharing Gateway with 4-Port Switch

4-16

NAT

Figure 4-11 Multiple Servers Behind NAT Example

4.3.3 Trigger Port Setup

The following is an example of trigger port forwarding.

Figure 4-12 Trigger Port Forwarding Process: Example

1. Jane requests a file from the Real Audio server (port 7070).

2. Port 7070 is a “trigger” port and causes the Prestige to record Jane’s computer IP address. The Prestige

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.