ZyXEL Communications P-660R-11V3 User Manual

Chapter 10 Network Address Translation (NAT)

P-660R-T1 v3 User’s Guide

This section contains more information regarding NAT.

Inside/outside denotes where a host is located relative to the ZyXEL Device, for example, the 
computers of your subscribers are the inside hosts, while the web servers on the Internet are 
the outside hosts. 
Public/local denotes the IP address of a host in a packet as the packet traverses a router, for 
example, the local address refers to the IP address of a host when the packet is in the local 
network, while the public address refers to the IP address of the host when the same packet is 
traveling in the WAN side. 

Address Mapping List

Rule

This is the rule’s index number.

Type

1-1: One-to-One mode maps one local IP address to one public IP address. Note 

that port numbers do not change for the One-to-One NAT mapping type. 
M-1: Many-to-One mode maps multiple local IP addresses to one public IP address. 

This is equivalent to the Single IP feature that previous ZyXEL routers supported 

only. 
M-M Ov (Overload): Many-to-Many Overload mode maps multiple local IP 

addresses to shared public IP addresses. 
MM No (No Overload): Many-to-Many No Overload mode maps each local IP 

address to unique public 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 inside local IP address. Local IP addresses are N/A for Server 

port mapping.

Local End IP

This is the ending inside local IP address. 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 N/A for One-to-one and Server mapping types.

Public Start IP

This is the starting inside public IP address. Enter 0.0.0.0 here if you have a dynamic 

IP address from your ISP. You can only do this for Many-to-One and Server 

mapping types. 

Public End IP

This is the ending inside public IP address. This field is N/A for One-to-one, Many-

to-One and Server mapping types.

SAVE

Click this to save your changes.

DELETE

Click this to remove the rule.

BACK

Click this to return to the previous screen without saving.

CANCEL

Click this to restore your previously saved settings.

Table 25   Network > NAT > Address Mapping (continued)