Tenda w306r Mode D'Emploi

ALG Service Settings 

ALG(Application Layer Gateway) 
In the context of computer networking, an ALG or 
application layer gateway consists of a security 
component that augments a firewall or NAT 
employed in a computer network. It allows 
customized NAT traversal filters to be plugged 
into the gateway to support address and port 
translation for certain application layer 
"control/data" protocols such as FTP, BitTorrent, 
SIP, RTSP, file transfer applications etc.   
 
In order for these protocols to work through NAT 
or a firewall, either the application has to know 
about an address/port number combination that 
allows incoming packets, or the NAT has to 
monitor the control traffic and open up port 
mappings (firewall pinhole) dynamically as 
required. Legitimate application data can thus be 
passed through the security checks of the firewall 
or NAT that would have otherwise restricted the 
traffic for not meeting its limited filter criteria.   
 
Usually allowing client applications to use 
dynamic ephemeral TCP/ UDP ports to 
communicate with the known ports used by the 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

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