ZyXEL P-663HN-51 User Guide - Page 87
Port Triggering
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Chapter 7 Network Address Translation (NAT) Screens Table 24 Advanced Setup > NAT > Virtual Servers > Add (continued) LABEL DESCRIPTION External Port Start Enter a port number in this field. To forward only one port, enter the port number again in the External Port End field. External Port End To forward a series of ports, enter the start port number here and the end port number in the External Port End field. Enter a port number in this field. To forward only one port, enter the port number again in the Start Port field above and then enter it again in this field. Protocol Internal Port Start Internal Port End Save/Apply To forward a series of ports, enter the last port number in a series that begins with the port number in the Start Port field above. This is the underlying protocol of the traffic to which this virtual server entry applies. Specify the starting port the ZyXEL Device uses for the traffic that it forwards based on this virtual server entry (or leave it the same as the External The ZyXEL Device automatically determines this port number. Click this button to save the changes and have the ZyXEL Device start using them. 7.4 Port Triggering 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 ZyXEL Device 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 ZyXEL Device's WAN port receives a response with a specific port number and protocol ("incoming" port), the ZyXEL Device 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. P-663HN-51 User's Guide 87