On Sun, Oct 12, 2008 at 11:22:06PM -0500, Danhua Shao wrote: > I check the source code, and found that the NFS v3 server handle request > "NULL" in rpc_null_v3() in nfs_server.c. But where is the corresponding > request on client side?
I suspect it's never called by the client (except via rpcinfo(1M)). The NULL ("ping") procedure is meant to be useful for diagnostics tools like rpcinfo(1M). That said, I lied: the RPCSEC_GSS client code does call the NULL procedure -- it has to, see RFC2203. Nico --