Re: Problems mounting via UDP from a netapp with multiple interfaces

[Malahal Naineni <malahal@us.ibm.com>]

Gregory Boyce [gregory.boyce@gmail.com] wrote:
> Folks,
> 
> I've been encountering a problem with NFS clients attempting to mount
> from a netapp via UDP where the netapp is responding on the wrong
> interface.  On some of our older systems, this mount worked properly,
> while on newer systems nfs-utils ends up failing the mount.  Mounting
> via TCP works fine.
> 
> It appears that there has been various related discussions over the
> years, and a relevant Redhat bug opened back in 2006:
> 
> http://article.gmane.org/gmane.linux.nfs/22778/match=connect+udp
> https://bugzilla.redhat.com/show_bug.cgi?id=208244
> 
> Is there a general recommendation for people in this sort of
> situation?  I'm assuming the code is currently using connected UDP
> sockets (I'm more of a sysadmin than a developer).  Is there an option
> I'm missing to disable this?  Otherwise does anyone know of a patch to
> change the behavior?

Just an FYI, I encountered this issue on user space ganesha NFS server.
Kernel NFS server uses PKTINFO to account for this. I fixed ganesha NFS
server as well to do the same!

Regards, Malahal.