ZyWALL 5/35/70 Series User’s Guide

The following table describes the labels in this screen.

Table 128 NAT Address Mapping Edit

LABEL

DESCRIPTION

 

 

Type

Choose the port mapping type from one of the following.

 

1. 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.

 

2. 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.

 

3. Many-to-Many Overload: Many-to-Many Overload mode maps multiple local IP

 

addresses to shared global IP addresses.

 

4. Many One-to-One: Many One-to-One mode maps each local IP address to

 

unique global IP addresses.

 

5. 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 Inside Local IP Address (ILA). Local IP addresses are N/A for

 

Server port mapping.

Local End IP

This is the end Inside 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-Oneand Server mapping types.

 

 

Global Start IP

This is the starting Inside 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 Inside Global IP Address (IGA). This field is N/A for One-to-

 

One, Many-to-One and Server mapping types.

Apply

Click Apply to save your changes back to the ZyWALL.

 

 

Cancel

Click Cancel to exit this screen without saving.

 

 

22.5 Port Forwarding

A port forwarding set is a list of inside (behind NAT on the LAN) servers, for example, web or FTP, that you can make visible to the outside world even though NAT makes your whole inside network appear as a single computer to the outside world.

You may enter a single port number or a range of port numbers to be forwarded, and the local IP address of the desired server. The port number identifies a service; for example, web service is on port 80 and FTP on port 21. In some cases, such as for unknown services or where one server can support more than one service (for example both FTP and web service), it might be better to specify a range of port numbers. You can allocate a server IP address that corresponds to a port or a range of ports.

Many residential broadband ISP accounts do not allow you to run any server processes (such as a Web or FTP server) from your location. Your ISP may periodically check for servers and may suspend your account if it discovers any active services at your location. If you are unsure, refer to your ISP.

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Chapter 22 Network Address Translation (NAT)