Orange Pi PC -- NFS won't mount

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Hello again.  I am beating my head against the network configuration again and would dearly love some help.

 

I have two orange pi pc boards with static ip's in the 192.168.1. range.  They are only connected to each other.  They can ping and ssh each other just fine.  I am trying to set up nfs shares between them without success.

In /etc/exports I have:

/home/martin/folder 192.168.1.*(rw,sync,no_subtree_check,nohide)

I have "ALL: 192.168.1." in my /etc/hosts.allow.  In /etc/fstab I have:

192.168.1.XXX:/home/martin/folder/from_lev /home/lev/folder/to_martin nfs rw,sync,noauto,user,x-systemd.automount 0 0

And vis-versa on the other pi.  The folders all exist.  I've rebooted, and tried a bunch of other things, but am still stuck.  "sudo mount -a" returns without an error, although with that automount in there I'm not sure if it's trying anything.  When I attempt to go into /folder/from lev the command line just hangs.  A "sudo showmount" command returns "clnt_create: RPC: Program not registered."  Google searches bring up a bunch of information about other distros, so I don't know if I have a firewall problem, port problem, services problem. . . 

 

Any ideas?  Thanks in advance.