NFS is normally turned on already on the SpycerBox, to check the services and config do this:
From command line:
Check what the share name is, enter this command:
And to verify the NFS sharing service is turned on:
service nfs status
From desktop GUI:
System > Administration > Server Settings > NFS
System > Administration > Services > scroll down to "nfs"
To mount the NFS from a Linux client do this:
mount -t nfs //path/to/share /mnt/nfs -o user=xxx,password=xxx,domain=nixcraft
/etc/fstab will need to be updated too to auto mount on reboot.