The analyzed traffic is then forwarded to the destination server or blocked. It analyzes the received traffic at the application level up to layer seven of the ISO/OSI layer model. The gateway acts as a communication partner to the clients and hides the actual destination addresses of the server. The gateway is implemented as a stand-alone device or as software in an existing device such as a firewall. The ALG is an additional security component that controls communication between clients from insecure networks such as the Internet and application servers. Alternative terms are application level gateway or application level proxy. The abbreviation for application layer gateway is ALG. Typical applications for an Application Layer Gateway.
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