When I ran rpcinfo -p on the client the output was: 2 entries for portmapper, 2 for status, and 1 for sqi_fam.
The rpcinfo for the server ip gives an error: rpc can't contact portmapper: RPC: Remote system error - Connection refused.
The showmount on the client gives the original error.
I'm beginning to think I should have asked a simpler question:
What needs to be installed on a client to use an NFS servers shares?
An rpcinfo on the server shows the same as the client plus 4 for rquotad, 6 for mountd, 2 for nfs, and 3 for nlockmgr.
The problem seems to be with the server from the output, but what is wrong has me stumped.