Configuration and Management
3.7.1UPnP IGD
The Ericsson W3x supports the Universal Plug and Play (UPnP) Internet Gateway Device (IGD) standard. UPnP IGD is used to provide automatic port forwarding allowing communication between certain Internet applications and the local network. When UPnP IGD is enabled, programs like MSN Messenger® and most network enabled games are allowed to pass the NAT service.
UPnP IGD is enabled by default, but if you want to disable the feature, clear the “Enable UPnP IGD” check box and click Apply 
to save the settings.
3.7.2Application Level Gateways
From a security perspective, certain Internet applications, for example FTP applications that open additional ports upon transfer, are especially problematic to handle. An Application Level Gateway (ALG) provides a translation and transportation service for such a specific application. Incoming data packets are checked against existing NAT and packet filtering rules, IP addresses are evaluated and a detailed packet analysis is performed. If necessary, the contents of a packet are modified and if a secondary port is required, the ALG will open one. The Ericsson W3x includes ALG support for the following applications:
Table 17 - ALG Supported Applications
Application | Protocol | Port |
|
| number |
|
|
|
File Transfer Protocol (FTP) | TCP | 21 |
|
|
|
Trivial File Transfer Protocol (TFTP) | UDP | 69 |
|
|
|
TCP/UDP | 1723 | |
|
|
|
Session Initiation Protocol (SIP) | TCP/UDP | 5060 |
|
|
|
Real Time Streaming Protocol (RTSP) | TCP/UDP | 554 |
|
|
|
The ALG for each application does not require additional configuration. The supported ALGs can be enabled and disabled individually.
To disable an ALG, clear the corresponding check box and click save the settings.
Apply 
to
48 |