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From: Sean Bruno <sean.bruno@dsl-only.net>
To: Michiel Boland <michiel@boland.org>
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Date: Wed, 28 Jan 2009 10:07:28 -0800
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Cc: current@freebsd.org
Subject: Re: NFS mounts dissapearing
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On Wed, 2009-01-28 at 18:52 +0100, Michiel Boland wrote:
> Sean Bruno wrote:
> > I've noted that my NFS mount of a directory is vanishing periodically
> > under -current.  I am unable to unmount/remount the directory and the
> > system returns Permission Denied on all attempts to access the
> > directory.
> > 
> > Is this something that is known and being investigated?
> 
> FWIW I am seeing this too, except that I can still umount/remount. It appears to 
> me that TCP connections to remote nfsd use a privileged source port initially, 
> but if the connection is severed and reestablished later the source port is no 
> longer < 1024. Client is -CURRENT, server is solaris with nfssrv:nfs_portmon=1.
> 
> Cheers
> Michiel

Here client is -CURRENT, server is linux with default NFS settings.

linux sysctl settings:
	sysctl -a |grep nfs
	fs.nfs.nlm_grace_period = 0
	fs.nfs.nlm_timeout = 10
	fs.nfs.nlm_udpport = 0
	fs.nfs.nlm_tcpport = 0
	fs.nfs.nsm_use_hostnames = 0
	fs.nfs.nsm_local_state = 0
	fs.nfs.nfs_callback_tcpport = 0
	fs.nfs.idmap_cache_timeout = 600
	fs.nfs.nfs_mountpoint_timeout = 500
	fs.nfs.nfs_congestion_kb = 79232
	sunrpc.nfs_debug = 0
	sunrpc.nfsd_debug = 0

Sean