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TheFast Local Internet Protocol (FLIP) is acommunication protocol forLAN andWAN, conceived fordistributed applications. FLIP was designed at theVrije Universiteit Amsterdam to supportremote procedure call (RPC) in theAmoebadistributed operating system.^[1]

In theOSI model, FLIP occupies thenetwork layer (3), thus replacingIP, but it also obviates the need for atransport layer (4) protocol likeTCP.

FLIP is aconnectionless protocol designed to support transparency (with respect to the underlying network layers of the OSI model: 2. data link and 1. physical), efficient RPC, group communication, secure communication and easy network management. The following FLIP properties helps to achieve the requirements of distributed computing:^[1]

1. FLIP identifies entities with a location-independent 64-bit identifier calledNetwork Service Access Points (NSAPs). An entity can, for example, be aprocess; contrary to the IP protocol where anIP address identifies ahost.
2. FLIP uses a one-way mapping between the “private” address, used to register an endpoint of a network connection, and the “public” address used to advertise the endpoint.
3. FLIP routes messages based on NSAP (transparency).
4. FLIP discovers routes on demand.
5. FLIP uses a bit in the message header to request transmission of sensitive messages across trusted networks.

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