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| ZyWALL 2 Series User’s Guide | |
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| Table | |
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| LABEL | DESCRIPTION |
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| Type | Choose the port mapping type from one of the following. |
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| 1. |
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| address. Note that port numbers do not change for |
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| 2. |
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| IP address. This is equivalent to SUA (i.e., PAT, port address translation), the Single |
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| User Account feature. |
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| 3. |
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| IP addresses to shared global IP addresses. |
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| 4. Many |
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| global IP addresses. |
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| 5. Server: This type allows you to specify inside servers of different services behind |
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| the NAT to be accessible to the outside world. |
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| Local Start IP | This is the starting Inside Local IP Address (ILA). Local IP addresses are N/A for |
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| Server port mapping. |
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| Local End IP | This is the end Inside Local IP Address (ILA). If your rule is for all local IP addresses, |
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| then enter 0.0.0.0 as the Local Start IP address and 255.255.255.255 as the Local |
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| End IP address. |
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| This field is N/A for |
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| Global Start IP | This is the starting Inside Global IP Address (IGA). Enter 0.0.0.0 here if you have a |
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| dynamic IP address from your ISP. |
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| Global End IP | This is the ending Inside Global IP Address (IGA). This field is N/A for |
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| Apply | Click Apply to save your changes back to the ZyWALL. |
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| Reset | Click Reset to begin configuring this screen afresh. |
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8.6Configuring 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 ZyWALL 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 ZyWALL's WAN port
NAT |