Network gateway
Gateways are the indispensable components in order to achieve communications between terminals connected to heterogeneous networks that use different protocols and have different network characteristics. Gateways are often used to enable users at remote locations to access different target systems (e.g., a computer system on a local area network). A network gateway provides the connectivity between remote systems (e.g., personal computers) at remote locations with the target systems of interest to enable different network applications. A gateway acts as the interface between proximity local area protocols and wide area protocols, such as TCP/IP (Transmission Control Protocol/Internet Protocol) on the Internet. A gateway also manages its client devices, aggregates their data, and performs other related tasks. The gateway provides mutual communication by performing communication protocol conversion between the public communication network and the private communication network. The gateway is also used in mutual protocol conversion between LANs (Local Area Network) that are constructed as private communication networks. The gateway routes user traffic to destinations in the local network or to an external network, such as the Internet. The gateway often functions as a service selection gateway (SSG) which allows users to connect to various subscribed, on-demand network services. A service selection gateway (SSG) facilitates a remote user to use various services provided using the Internetworking technologies.
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