ZyXEL Communications P-660W-T1 v2, Руководство пользователя

Страница: 98 / 244

Chapter 8 Network Address Translation (NAT) Screens
P-660W-Tx v2 User’s Guide
98
The following table describes the fields in this screen.
8.3 NAT Technical Reference
This section provides some technical background information about the topics covered in this
chapter.
8.3.1 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.
Global/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 global address refers to the IP address of the host when the same packet is
traveling in the WAN side.
Table 31 Edit Address Mapping Rule
LABEL DESCRIPTION
Type Choose the port mapping type from one of the following.
•
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.
• 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 that previous ZyXEL routers supported
only.
• Many-to-Many Overload : Many-to-Many Overload mode maps multiple local IP
addresses to shared global IP addresses.
• Many-to-Many No Overload : Many-to-Many No Overload mode maps each
local IP address to unique global 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 local IP address (ILA). Local IP addresses are N/A for Server
port mapping.
Local End IP This is the end 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-One and Server mapping types.
Global Start IP This is the starting 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 global IP address (IGA). This field is N/A for One-to-One , Many-
to-One and Server mapping types.
Server Mapping
Set
Only available when Type is set to Server .
Select a number from the drop-down menu to choose a server set from the NAT -
Address Mapping Rules screen.
Edit Details Click this link to go to the NAT - Edit SUA/NAT Server Set screen to edit a server
set that you have selected in the Server Mapping Set field.
Apply Click Apply to save your changes back to the ZyXEL Device.
Cancel Click Cancel to return to the previously saved settings.
Delete Click Delete to exit this screen without saving.