I have a kfreebsd (debian 7 / kernel 9.0) system serving zfs file systems over nfsv3 to linux (debian 7). It seems to work well, though there are some user reports of problems using Libre Office document recovery that I haven't looked into yet. I also failed to use nfsv4. I manually maintain /etc/exports. I think that is the only impact of the "mountd isn't supported" error. Jeff