RHEL 6.3 NFS server reports errors when multiple NFSv4 clients access it with the same IP address

Solution In Progress - Updated -

Issue

  • In this case, we will have a 192.168.xxx.xxx IP for the internal facing interface. The file server is seeing the internal IP, not the external IP, and this is causing an issue. The problem seems to be that when connecting to the file server, that internal IP is being used as the system ID. We need a way to ONLY use the external facing IP, which is always unique.

  • In this case there are multiple NFS clients behind different firewalls. These NFS clients are configured to be identical. When these NFS clients access the same files on the NFS server it gets the following errors:

May 6 16:38:57 hosta kernel: NFSD: nfsd4_open filename .filename op_stateowner (null)
May 6 16:38:57 hosta kernel: NFSD: warning: no callback path to client 192.168.xx.xx/yyyy.yyy.yyy.200 tcp UNIX 0: error -5
May 6 16:38:57 hosta kernel: NFSD: move_to_confirm nfs4_client ffffxxxxxxxxxxx

Environment

  • Red Hat Enterprise Linux 6.3
  • NFSv4

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