portmapper

portmapper

(networking)
A server that converts TCP/IP protocol port numbers into RPC program numbers. It must be running in order to make RPC calls.

When an RPC server starts, it tells portmap the port number it is listening on and what RPC program numbers it serves. Before a client can call a given RPC program number, it must contacts portmap on the server machine to determine the port number to which RPC packets should be sent.
References in periodicals archive ?
The broadcast RPC shall be to either the portmapper itself on Port 111 (querying for VXI-11 support) or the Null procedure (procedure 0) on the Program Number assigned to the VXI-11 Core Service (0x0607AF)."
The first part of this requirement is creating the portmapper process for a broadcast packet to Port 111.
The second part of the portmapper is supporting a standard RPC to the Null procedure.