The Alg Screen - ZyXEL Communications P-660H-61 User Manual

Chapter 9 Network Address Translation (NAT)
The following table describes the fields in this screen.
Table 45 Network > NAT > Address Mapping: Edit
LABEL
Type
Local Start IP
Local End IP
Global Start IP
Global End IP
Server Mapping
Set
Edit Details
Back
Apply
Cancel

9.5 The ALG 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 ZyXEL Device registers with the SIP register server, the SIP ALG translates the ZyXEL
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 ZyXEL Device is behind a SIP ALG.
158
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.
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.
Click this to return to the previous screen without saving.
Click this to save your changes.
Click this to restore your previously saved settings.
ADSL Router Series User's Guide