create a new shared folder on the nas call it “data”
enable NFSv4, disable NFSv3
specify list of IPs that are allowed to access the NFSv4 share:
- don’t forget to hit “Apply”
- the idea is “anyway” to NAS<-directly-LAN-1000MBit->PC connect the NAS to the GNU Linux 10 based PC for maximum speed (PC will get fixed IP so no problem here)

<span style="color: #00ffff;">lsb_release -a</span>; # tested on
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 10 (buster)
Release:    10
Codename:   buster

su - root; # become root
# create mount point
<span style="color: #00ffff;">mkdir /media/user/nfs/</span>

# the actual mounting process
<span style="color: #00ffff;">mount -v -t nfs4 192.168.0.230:/data/ /media/user/nfs/
</span>

possible errors: portmap query failed: RPC: Program/version mismatch / Protocol not supported

in this case what fixed those errors, was to allow access from specific list of IPs:

mount.nfs4: timeout set for Mon Mar 14 16:32:09 2022
mount.nfs4: trying text-based options 'vers=4.2,addr=192.168.0.230,clientaddr=192.168.0.222'
mount.nfs4: mount(2): Protocol not supported
mount.nfs4: trying text-based options 'vers=4.1,addr=192.168.0.230,clientaddr=192.168.0.222'
mount.nfs4: mount(2): No such file or directory
mount.nfs4: trying text-based options 'addr=192.168.0.230'
mount.nfs4: prog 100003, trying vers=3, prot=6
mount.nfs4: trying 192.168.0.230 prog 100003 vers 3 prot TCP port 2049
mount.nfs4: portmap query retrying: RPC: Program/version mismatch
mount.nfs4: prog 100003, trying vers=3, prot=17
mount.nfs4: trying 192.168.0.230 prog 100003 vers 3 prot UDP port 2049
mount.nfs4: portmap query failed: RPC: Program/version mismatch
mount.nfs4: Protocol not supported

manpages:

mount.nfs4.man.txt

#linux #gnu #gnulinux #opensource #administration #sysops #qnap #nas #nfs #storage

Originally posted at: https://dwaves.de/2022/03/14/gnu-linux-debian-10-how-to-access-qnap-ts-219p-nas-via-nfsv4-portmap-query-failed-rpc-program-version-mismatch-protocol-not-supported/