ZyXEL Communications Corporation AMG1302 Manuel D’Utilisation

 Chapter 9 Network Address Translation (NAT)

AMG1302-T10A User’s Guide

The following table describes the fields in this screen.

Some NAT routers may include a SIP Application Layer Gateway (ALG). A SIP ALG allows SIP calls 

to pass through NAT by examining and translating IP addresses embedded in the data stream. 

When the Device registers with the SIP register server, the SIP ALG translates the Device’s private 

IP address inside the SIP data stream to a public IP address. You do not need to use STUN or an 

outbound proxy if your Device is behind a SIP ALG.

Network > NAT > Address Mapping: Edit 

Type

Choose the port mapping type from one of the following. 

: 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 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 mode maps multiple local IP 

addresses to shared global IP addresses. 

: Many-to-Many No Overload mode maps each local IP 

address to unique global IP addresses. 

: This type allows you to specify inside servers of different services behind the NAT 

to be accessible to the outside world.

Local Start IP 

Address

This is the starting local IP address (ILA). Local IP addresses are N/A for Server port 

mapping.

Local End IP 

Address

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 

Address

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 

Address

This is the ending global IP address (IGA). This field is N/A for One-to-One, Many-to-

 and Server mapping types.

Server Mapping 

Set

Edit Details

Click this link to go to the Port Forwarding screen to edit a port forwarding set that you 

have selected in the Server Mapping Set field.

Back

Click this to return to the previous screen without saving.

Apply

Click this to save your changes.

Cancel

Click this to restore your previously saved settings.