Lectures notes for 2010 - KTH

Port Mapper
RPC server programs use ephemeral ports - thus we need a well known port to be
able to find them
Servers register themselves with a registrar - the port mapper
(called rpcbind in SVR4 and other systems using TI-RPC)
Port mapper is at well know port: 111/UDP and 111/TCP
The port mapper is an RPC server with program number 100000, version 2, a TCP
port of 111, a UDP port of 111.
Servers register themselves with RPC calls and clients query with RPC calls:
• PMAPPROC_SET - register an entry
• PMAPPROC_UNSET - unregister an entry
• PMAPPROC_GETPORT - get the port number of a given instance
• PMAPPROC_DUMP - returns all entries (used by “rpcinfo -p”)
Maguire Network File System (NFS) 5: 58 of 77
maguire@kth.se 2010.03.21 Internetworking/Internetteknik