If you're trying to access NFSv4 shares from Linux, you may found yourself stumbling on
mount: Invaild Argument
In that case, you should try to add
insecure flag to your share in
# exportfs -rav
Now you should be able to mount the share on Haiku
This is noted in
secure This option requires that requests originate on an on an Internet port less than IPPORT_RESERVED (1024). This option is on by default. To turn it off, specify insecure.
The insecure option in this entry also allows clients with NFS implementations that don't use a reserved port for NFS.