Re: [nfsv4] NFS4 over VPN hangs when connecting > 2 clients

["J. Bruce Fields" <bfields@fieldses.org>]

On Mon, Mar 19, 2012 at 02:29:46PM -0400, Chuck Lever wrote:
> 
> On Mar 19, 2012, at 2:27 PM, J. Bruce Fields wrote:
> 
> > On Mon, Mar 19, 2012 at 01:47:14PM -0400, Chuck Lever wrote:
> >> 
> >> On Mar 19, 2012, at 1:36 PM, J. Bruce Fields wrote:
> >>> Well, sure, but all I'm proposing here is returning NFS4ERR_INUSE in the
> >>> case where we get setclientid's with the same client-provided id.
> >>> There'd be no change of behavior in the case of multiple clients sharing
> >>> an IP (which is fine, of course).
> >> 
> >> The migration draft proposes that clients use the same nfs_client_id4 string for all of a server's IP addresses.  Would a server then be obliged to return NFS4ERR_CLID_IN_USE if a client attempts a SETCLIENTID with the same boot verifier and nfs_client_id4 on more than one IP address for the same server?
> > 
> > That's also not this case, sorry, this time with all the conditions:
> > 
> > 	- if the nfs_client_id4 is the same, and
> > 	- if the flavor is auth_sys, and
> > 	- if the client IP address is different,
> > 	- then return NFS4ERR_INUSE.
> 
> This still breaks for multi-homed servers and UCS clients.  The client IP address can be different depending on what server IP address the client is accessing, but all the other parameters are the same.

OK.  So probably there's nothing we can do to help here.

As a bandaid maybe a rate-limited log message ("clientid X now in use
from IP Y") might help debug these things....

--b.