ZyXEL P-662HW-61 User Guide - Page 151
Trigger Port
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Chapter 9 Network Address Translation (NAT) Screens The following table describes the fields in this screen. Table 56 Edit Address Mapping Rule LABEL DESCRIPTION Type Choose the port mapping type from one of the following. • One-to-One: One-to-One mode maps one local IP address to one global IP address. Note that port numbers do not change for One-to-one NAT mapping type. • Many-to-One: Many-to-One mode maps multiple local IP addresses to one global IP address. This is equivalent to SUA (i.e., PAT, port address translation), ZyXEL's Single User Account feature that previous ZyXEL routers supported only. • Many-to-Many Overload: Many-to-Many Overload mode maps multiple local IP addresses to shared global IP addresses. • Many-to-Many No Overload: Many-to-Many No Overload mode maps each local IP address to unique global IP addresses. • Server: This type allows you to specify inside servers of different services behind the NAT to be accessible to the outside world. Local Start IP This is the starting local IP address (ILA). Local IP addresses are N/A for Server port mapping. Local End IP This is the end local IP address (ILA). If your rule is for all local IP addresses, then enter 0.0.0.0 as the Local Start IP address and 255.255.255.255 as the Local End IP address. This field is N/A for One-to-One and Server mapping types. Global Start IP This is the starting global IP address (IGA). Enter 0.0.0.0 here if you have a dynamic IP address from your ISP. Global End IP This is the ending global IP address (IGA). This field is N/A for One-to-One, Manyto-One and Server mapping types. Server Mapping Only available when Type is set to Server. Set Select a number from the drop-down menu to choose a server mapping set. Edit Details Click this link to go to the Port Forwarding screen to edit a server mapping set that you have selected in the Server Mapping Set field. Back Click Back to return to the previous screen. Apply Click Apply to save your changes back to the ZyXEL Device. Cancel Click Cancel to begin configuring this screen afresh. 9.7 Trigger Port 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 P-662H/HW-D Series User's Guide 151