We have a couple of servers (part of an HPC cluster) in which we're currently seeing some NFS behavior which is not making sense to me. node1 exports its /lscratch directory via NFS to node2, mounted at /scratch/node1. node2 also exports its own lscratch, which is correspondingly mounted at /scratch/node2 on node1.

Unfortunately, whenever I attempt to mount either NFS export on the opposite node, I get the following error:

mount: node1:/lscratch failed, reason given by server: Permission denied

This despite the fact that I have included first the IP range (10.6.0.0) and then the specific IPs (10.6.7.1, 10.6.7.2) in /etc/exports.

Any suggestions?

Edit to remove ambiguity: I've made sure that exports only contains either the range, or the specific IPs, not both at the same time.