Address Mapping
Address mapping can map local IP Addresses to global IP addresses. Ordering your rules is important because the Zyxel Device applies the rules in the order that you specify. When a rule matches the current packet, the Zyxel Device takes the corresponding action and the remaining rules are ignored.
Use this screen to enable or disable the NAT Address Mapping in the Zyxel Device.
Address Mapping Screen
Click Network Setting > NAT > Address Mapping to open the Address Mapping screen.
Network Setting > NAT > Address Mapping
The following table describes the fields in this screen.
Network Setting > NAT > Address Mapping
Label
Description
Add New Rule
Click this to create a new rule.
Rule Name
This is the name of the rule.
Local Start IP
This is the starting Inside Local IP Address (ILA).
Local End IP
This is the ending Inside Local IP Address (ILA). If the rule is for all local IP addresses, then this field displays 0.0.0.0 as the Local Start IP address and 255.255.255.255 as the Local End IP address. This field is blank for One-to-One 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. You can only do this for the Many-to-One mapping type.
Global End IP
This is the ending Inside Global IP Address (IGA). This field is blank for One-to-One and Many-to-One mapping types.
Type
This is the address mapping type.
One-to-One: This mode maps one local IP address to one global IP address. Note that port numbers do not change for the One-to-One NAT mapping type.
Many-to-One: This mode maps multiple local IP addresses to one global IP address. This is equivalent to SUA (i.e., PAT, port address translation), the Device's Single User Account feature that previous routers supported only.
Many-to-Many: This mode maps multiple local IP addresses to shared global IP addresses.
WAN Interface
This is the WAN interface to which the address mapping rule applies.
Modify
Click the Edit icon to go to the screen where you can edit the address mapping rule.
Click the Delete icon to delete an existing address mapping rule. Note that subsequent address mapping rules move up by one when you take this action.
Add New Rule Screen
To add or edit an address mapping rule, click Add New Rule or the Modify icon in the Address Mapping screen to display the screen shown next.
Network Setting > NAT > Address Mapping > Add New Rule
The following table describes the fields in this screen.
Network Setting > NAT > Address Mapping > Add New Rule 
LABEL
Description
Rule Name
Enter a descriptive name for this rule. You can use up to 20 printable characters except [ " ], [ ` ], [ ' ], [ < ], [ > ], [ ^ ], [ $ ], [ | ], [ & ], or [ ; ]. Spaces are allowed.
Type
Choose the IP or port mapping type from one of the following.
One-to-One: This mode maps one local IP address to one global IP address. Note that port numbers do not change for the One-to-One NAT mapping type.
Many-to-One: This mode maps multiple local IP addresses to one global IP address. This is equivalent to SUA (for example, PAT, port address translation), the device's Single User Account feature that previous routers supported only.
Many-to-Many: This mode maps multiple local IP addresses to shared global IP addresses.
Local Start IP
Enter the starting Inside Local IP Address (ILA).
Local End IP
Enter the ending Inside Local IP Address (ILA). If the rule is for all local IP addresses, then this field displays 0.0.0.0 as the Local Start IP address and 255.255.255.255 as the Local End IP address. This field is blank for One-to-One mapping types.
Global Start IP
Enter the starting Inside Global IP Address (IGA). Enter 0.0.0.0 here if you have a dynamic IP address from your ISP. You can only do this for the Many-to-One mapping type.
Global End IP
Enter the ending Inside Global IP Address (IGA). This field is blank for One-to-One and Many-to-One mapping types.
WAN Interface
Select a WAN interface to which the address mapping rule applies.
Cancel
Click Cancel to exit this screen without saving.
OK
Click OK to save your changes.