AUTH_SYS, idmap, and upgrading from NFSv3

[David Shaw]

Hi,

Here is my situation: two machines, one a NFS server (running 2.6.17)
and one a NFS client (running 2.6.12).  I'm currently using NFSv3.
For various historical reasons, the client machine has many users in
/etc/passwd that don't exist on the server machine.  In NFSv3, this
isn't a problem: the server just assigns the proper uid and gid to the
file locally, and when it is listed on the client, the proper username
and group shows up.

In trying to get NFSv4 working, however, I've run into a problem.  I'm
using AUTH_SYS, and all the users that don't exist on the server show
up as "nobody" on the client.

Is there any way, aside from putting all of the usernames from the
client on the server, to get the right names to appear when listing
files on the client?  I am using the same domain in idmapd.conf, and I
do understand that the RPC authentication and the NFSv4 naming aren't
the same thing.

David