source :
https://community.synology.com/enu/foru ... ply=431116
"That's the part that wasn't working for me. I could mount from the command line but not from /etc/fstab.
I just spent another half an hour piddling and finally got it to work. I think my mistake was including the volume in the server spec (e.g.
<ip-address>/volume2/homes/<user> instead of <ip-address>/homes/<user>). Apparently I was doing it correctly on the command line but not in /etc/fstab. And now I've read mount.cifs so I have the Samba version locked to 3.0, I'm using a credentials file, and I the mount set to read-write. Still can't change file modes but apparently that's baked into the protocol.
So thanks for poking at me, all it took was one more push to figure out my mistake.
As to the purpose of the post, it was mostly my reaction to not getting NFS to work no matter what I did (and reading ever so many online rants about the same thing). I suspect it is possible, though it seems to require synchronizing UIDs and GIDs with the NAS or squashing all permissions to admin, neither of which I wanted to do.
Now that I have Samba working I can let NFS go!"
In the meantime I read articles that if you have Samba that is enough.
Learn, have fun and enjoy.
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