ZyXEL Communications P-660RU-T1 v3, User Manual, Page: 95 / 230

Chapter 10 Network Address Translation (NAT)
P-660RU-Tx v3 User’s Guide
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10.6 NAT Technical Reference
This section contains more information regarding NAT.
10.6.1 NAT Definitions
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.
Public End IP This is the ending public IP address. This field is N/A for One-to-One , Many-to-One
and Server mapping types.
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)
LABEL DESCRIPTION