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Chapter 8 Network Address Translation (NAT)
P-870HN-51D User’s Guide
134
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.
For example:
Figure 64 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 P-870HN-51D to record Jane’s
computer IP address. The P-870HN-51D associates Jane's computer IP address
with the "open" port range of 6970-7170.
3 The Real Audio server responds using a port number ranging between 6970-7170.
4 The P-870HN-51D 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 P-870HN-51D times out in three minutes with UDP (User Datagram
Protocol) or two hours with TCP/IP (Transfer Control Protocol/Internet Protocol).
Click NAT > Trigger Port to open the following screen. Use this screen to view
and configure your P-870HN-51D’s trigger port settings.
Figure 65 Trigger Port
Jane’s
Computer
Real Audio Server