Application Gateway

An application gateway is used to connect a particular type of application over a network connection to one or more specific hosts that serve the purpose of the application when the router may or may not allow that type of data transfer. Therefore an application gateway working with a router filter could stop a direct connection to, say, an ftp server outside the local area network (LAN) unless the application gateway was used. This ensures different applications to use network connections in a controlled manner that may not be permitted by the router and hence enhance security.