Tuesday, 21 November 2017

NFSv3 services and port numbers

NFS relies on RPC port for client connections.

NFS relies on rpcbind to assign port dynamically. However, if these ports can be manually assigned using the /etc/sysconfig/nfs file.

Name of service: Port number  :: Description
NFS: 2049   :: Primary service for NFS Protocol
Portmap : 111 :: service that translates the RPC program numbers into TCP or UDP ports and enables RPC services to talk to each other
Mountd: 635 :: service that enables the server to grant remote access privileges to a restricted set of client via export control
lockd4045 :: NLM or lock manager a protocol to maintain lock state at the client-server level ; maintains stateful aspects of file locking
statd: 4046  :: Network status manager service that enables a client /server to inform all peers when the services is restarted so any hanging lock can be released or reclaimed.



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