Philips CGA5722/05 Manuale Utente

Configuring the Wireless ADSL Modem Routerr

13

Network Address Translation allows multiple users to access the 
Internet sharing one public IP.

Allows one or more public IP addresses to be shared by multiple 
internal users. This also hides the internal network for increased privacy 
and security. Enter the Public IP address you wish to share into the 
Global IP field. Enter a range of internal IPs that will share the global IP 
into the "from" field.

If you configure the ADSL Wireless Base Station as a virtual server, 
remote users accessing services such as web or FTP at your local site 
via public IP addresses can be automatically redirected to local servers 
configured with private IP addresses. In other words, depending on the 
requested service (TCP/UDP port number), the ADSL Wireless Base 
Station redirects the external service request to the appropriate server 
(located at another internal IP address).

For example, if you set Type/Public Port to TCP/80 (HTTP or web) and 
the Private IP/Port to 192.168.2.2/80, then all HTTP requests from 
outside users will be transferred to 192.168.2.2 on port 80. Therefore, 
by just entering the IP address provided by the ISP, Internet users can 
access the service they need at the local address to which you redirect 
them.

A list of ports is maintained at the following link:
http://www.iana.org/assignments/port-numbers

Some applications require multiple connections, such as Internet 
gaming, video-conferencing, and Internet telephony.

These applications may not work when Network Address Translation 
(NAT) is enabled. If you need to run applications that require multiple 
connections, use these pages to specify the additional public ports to be 
opened for each application.

This page displays the current NAPT (Network Address Port 
Translation) address mappings.