/mnt/share_dir 192.168.7.101(ro,all_squash,async,no_subtree_check) 192.168.7.11(ro,all_squash,async,no_subtree_check) 

I've added fsid=0 and insecure to the export options but it didn't work.

/mnt/share_dir 192.168.7.101(ro,fsid=0,all_squash,async,no_subtree_check) 192.168.7.11(ro,fsid=0,all_squash,async,no_subtree_check) 

The share seems to be active for both clients.

# exportfs -s /mnt/share_dir 192.168.7.101(ro,async,wdelay,root_squash,all_squash,no_subtree_check,fsid=0,sec=sys,ro,secure,root_squash,all_squash) /mnt/share_dir 192.168.7.11(ro,async,wdelay,root_squash,all_squash,no_subtree_check,fsid=0,sec=sys,ro,secure,root_squash,all_squash) 

I've set fsid=0 and insecure to the export options, but it didn't work.

$ sudo showmount -e 192.168.7.10 Export list for 192.168.7.10: /mnt/backup/backup1/Videos 192.168.7.101 

$ sudo showmount -e 192.168.7.10 Export list for 192.168.7.10: /mnt/share_dir 192.168.7.101