ZyXEL P-320W User Guide - Page 106
Trigger Port Forwarding
View all ZyXEL P-320W manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 106 highlights
P-320W User's Guide The following table describes the labels in this screen. Table 44 NAT: Port Forwarding: Rule Setup LABEL DESCRIPTION Active Select the check box to enable this port forwarding entry. Clear the checkbox to disallow forwarding of these ports to an inside server without having to delete the entry. Service Name Type a Service Name to identify this port-forwarding rule. Start Port Type a start port number. To forward only one port, enter it again in the End Port field. To specify a range of ports, enter the last port to be forwarded in the End Port field. End Port Type an end port number. Server IP Address Type the inside IP address of the server. Apply Click Apply to save your changes back to the Prestige. Cancel Click Cancel to return to the previous screen and not save your changes. 8.4 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 Prestige 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 Prestige's WAN port receives a response with a specific port number and protocol ("incoming" port), the Prestige 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. 8.4.1 Trigger Port Forwarding Example The following is an example of trigger port forwarding. 106 Chapter 8 Network Address Translation (NAT)