Re: need info on IPv6 support for NFS in RHEL and SLES distros

[Chuck Lever <chuck.lever@oracle.com>]

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Steinar H. Gunderson wrote:
> On Wed, Aug 29, 2007 at 12:19:27PM -0400, Chuck Lever wrote:
>> No Linux distribution contains IPv6 support for NFS right now.  The 
>> implementation is still being developed.
> 
> Speaking of which, what's missing now? I see text-based mounts, client-side
> IPv6 RPC and server-side transport switch (of which the first two are already
> in mainline, and the last seems to be on its way) -- my impression was that
> these are all important building blocks. I guess nfs-utils will also need
> some patching, and an IPv6 transport will be needed for plugging into the
> server side transport switch, but after that?

This may be impolitic to say in public, but the transport switch APIs 
aren't really needed for IPv6.  It just seemed easier to apply the IPv6 
changes to the transport switch work than the other way around.

On the client, we will need IPv6 addressing support from the mount.nfs 
command through to the network transport implementations.  We have 
pieces of that implemented.

The client needs to have NFSv4 callback support and lockd support for 
IPv6, so we need RPC server support for IPv6 -- that's nearing 
completion once we have the ip_map cache fixed up to support IPv6 addresses.

On the server, we need support for mountd and rpcbind, and support build 
into the NFS server itself.  I understand Bull is still working on the 
server changes, and SteveD has added rpcbind to Fedora and is making it 
robust.

In addition I think we will need to examine exportfs and anything else 
on the server side to check for any dependence on address format.

To finish, Bull has been testing parts of this work as it has been 
developed, and will need to continue testing it after it has all been 
integrated.  Interoperability testing between Linux, Solaris, and AIX 
are on the list.

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