Chapter 9 Network Address Translation (NAT)
P-79X Series User’s Guide
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The following table describes the fields in this screen.
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 P-79X registers with the SIP register server, the SIP ALG translates the P-79X’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 P-79X is behind a SIP ALG.
Use this screen to enable and disable the SIP (VoIP) ALG in the P-79X. To access this screen, click
Network > NAT > ALG.
Table 31 Network > NAT > Address Mapping: Edit
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 port forwarding 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.
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