The proxy server hides Internet Protocol (IP) addresses and other secure data on the user behalf. The application gateway resides on the user and server firewall. For instance, when a user requests access to server resources including files, Web pages and databases, the user first connects with the proxy server, which then creates a connection with the main server. These functions can include address and port translation, resource allocation, software response control, and synchronization of information and control traffic.īy acting as a proxy for the application servers and handling application protocols including SIP and FTP, an application layer gateway can control application session initiation and shield the application servers by avoiding or removing connections when appropriate to deliver application layer security.Īpplication gateways supports high-level secure network system communication.

It can perform a several functions at the application layer of an infrastructure, generally known as layer 7 in the OSI model. Such network applications such as File Transfer Protocol (FTP), Telnet, Real Time Streaming Protocol (RTSP) and BitTorrent.Īn application layer gateway also known as an application proxy gateway. It filters incoming node traffic to certain specifications which define that only transmitted network application information is filtered. An application gateway or application level gateway (ALG) is a firewall proxy which offers network security.

Application level gateway