ZyXEL p-2602r-d1a Manual Do Utilizador

P-2602R/RL-DxA Series User’s Guide

Chapter 9 Network Address Translation (NAT) Screens

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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 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. 

Use this screen to enable and disable the SIP (VoIP) ALG in the ZyXEL Device. To access 
this screen, click Network > NAT > ALG.

Table 34   Port Forwarding Rule Setup 

Active

Click this check box to enable the rule.

Service Name

Enter a name to identify this port-forwarding rule.

Start Port 

Enter a port number in this field. 
To forward only one port, enter the port number again in the End Port field. 
To forward a series of ports, enter the start port number here and the end port 

number in the End Port field.

End Port 

Enter a port number in this field. 
To forward only one port, enter the port number again in the Start Port field above 

and then enter it again in this field. 
To forward a series of ports, enter the last port number in a series that begins with 

the port number in the Start Port field above.

Server IP 

Address

Enter the inside IP address of the server here.

Back

Click Back to return to the previous screen.

Apply

Click Apply to save your changes back to the ZyXEL Device.

Cancel

Click Cancel to begin configuring this screen afresh.