When you're using rpcgen, how does the caller find the callee?

The procedure has two steps. There is a port mapper running on port 111 and a RPC service registers through and is discovered by this service but may itself run on an arbitrary port.

The procedure has two steps. There is a port mapper running on port 111 and a RPC service registers through and is discovered by this service but may itself run on an arbitrary port. See RFC 1833 - Binding Protocols for ONC RPC Version 2 for details.

On an RPC server machine, there is a process running called the endpoint mapper (this applies specifically to ONC RPC but other RPC mechanisms will be similar). This process runs on a known port. A server will start up and register itself with the enpoint mapper, giving its code (e.g. , MULT and port number) and the endpoint mapper will dutifully store that information.

When a client connects to the endpoint mapper using the IP address, it gives the desired code (MULT) and the endpoint mapper then provides the final destination - now the client knows the IP address and port for the MULT service. At that point, the enpoint mapper can step out of the way and let the client open up a session directly with the MULT service.

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