12-08-2008
If the NFS servers are all still working and have some form of Unix running on them then I would run a "showmount -a" on the NFS server you wish to move client mounts from, this will list the clients that have mounts from that server and what directories they are mounting.
At the client you could run a "snoop" filtering on NFS type packets only and then run a command to an "ls" inside each NFS mount to generate some traffic and see what IP addresses it is going to that way? A bit drastic I know!
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LEARN ABOUT FREEBSD
showmount
SHOWMOUNT(8) BSD System Manager's Manual SHOWMOUNT(8)
NAME
showmount -- show remote nfs mounts on host
SYNOPSIS
showmount [-a | -d] [-e] [-1] [-3] [host]
DESCRIPTION
The showmount utility shows status information about the NFS server on host. By default it prints the names of all hosts that have NFS file
systems mounted on the host. See NFS: Network File System Protocol Specification, RFC 1094, Appendix A, and NFS: Network File System Version
3 Protocol Specification, Appendix I, for a detailed description of the protocol.
The following options are available:
-a List all mount points in the form:
host:dirpath.
-d List directory paths of mount points instead of hosts.
-e Show the host's exports list.
-1 Use mount protocol Version 1, compatible with legacy servers.
-3 Ignored for backwards compatibility.
SEE ALSO
mount(8), mount_nfs(8), mountd(8)
HISTORY
The showmount utility first appeared in 4.4BSD.
BUGS
The mount daemon running on the server only has an idea of the actual mounts, since the NFS server is stateless. The showmount utility will
only display the information as accurately as the mount daemon reports it.
BSD
August 16, 2014 BSD