Trigger Port; Table 56 Edit Address Mapping Rule - ZyXEL Communications P-662H-61 User Manual

The following table describes the fields in this screen.

Table 56 Edit Address Mapping Rule

LABEL
Type
Local Start IP
Local End IP
Global Start IP
Global End IP
Server Mapping
Set
Edit Details
Back
Apply
Cancel

9.7 Trigger Port

Some services use a dedicated range of ports on the client side and a dedicated range of ports
on the server side. With regular port forwarding you set a forwarding port in NAT to forward a
service (coming in from the server on the WAN) to the IP address of a computer on the client
side (LAN). The problem is that port forwarding only forwards a service to a single LAN IP
address. In order to use the same service on a different LAN computer, you have to manually
replace the LAN computer's IP address in the forwarding port with another LAN computer's IP
address.
Trigger port forwarding solves this problem by allowing computers on the LAN to
dynamically take turns using the service. The ZyXEL Device records the IP address of a LAN
computer that sends traffic to the WAN to request a service with a specific port number and
protocol (a "trigger" port). When the ZyXEL Device's WAN port receives a response with a
specific port number and protocol ("incoming" port), the ZyXEL Device forwards the traffic
P-662H/HW-D Series User's Guide
Chapter 9 Network Address Translation (NAT) Screens
DESCRIPTION
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.
This is the starting local IP address (ILA). Local IP addresses are N/A for Server port
mapping.
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.
This is the starting global IP address (IGA). Enter 0.0.0.0 here if you have a dynamic
IP address from your ISP.
This is the ending global IP address (IGA). This field is N/A for One-to-One, Many-
to-One and Server mapping types.
Only available when Type is set to Server.
Select a number from the drop-down menu to choose a server mapping set.
Click this link to go to the Port Forwarding screen to edit a server mapping set that
you have selected in the Server Mapping Set field.
Click Back to return to the previous screen.
Click Apply to save your changes back to the ZyXEL Device.
Click Cancel to begin configuring this screen afresh.
151