[Samba] Share mounts in SMBv1 mode, but fails weirdly in SMBv2 mode

Hadrien Grasland grasland at lal.in2p3.fr
Fri Oct 13 12:00:34 UTC 2017

Le 13/10/2017 à 01:46, Jeremy Allison via samba a écrit :
> On Thu, Oct 12, 2017 at 03:58:58PM +0200, Hadrien Grasland via samba wrote:
>> Hi,
>> We're slowly deprecating SMBv1 support at work, so I'm trying to
>> mount our Samba network shares using SMBv2.0. This should in
>> principle be supported by the server, and seems works well enough
>> for the Windows clients. But it fails for me with some errors which
>> I do not understand.
>> Can you help me figure out what's going on? Here's my system
>> configuration and a quick summary of what I have so far:
>> hadrien at linux-2ak3:~> uname -a
>> Linux linux-2ak3 4.13.5-1-default #1 SMP PREEMPT Thu Oct 5 18:28:26
>> UTC 2017 (3fd9659) x86_64 x86_64 x86_64 GNU/Linux
>> hadrien at linux-2ak3:~> /sbin/mount.cifs --version
>> mount.cifs version: 6.5
>> hadrien at linux-2ak3:~> sudo mount -v -t cifs //nfsserv22/expsi test
>> -o credentials=<path to credentials file>,vers=2.0
>> domain=LAL
>> mount.cifs kernel mount options: ip=,unc=\\nfsserv22\expsi,vers=2.0,user=grasland,,domain=LAL,pass=********
>> mount error(95): Operation not supported
>> Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)
>> hadrien at linux-2ak3:~> dmesg | tail
>> [...]
>> [13424.783242] CIFS VFS: ioctl error in smb2_get_dfs_refer rc=-2
>> [13424.789504] CIFS VFS: cifs_read_super: get root inode failed
>> Replacing "vers=2.0" with "vers=1.0" in the mount command line makes
>> this work, so I'm quite confident that my general configuration is
>> correct and the problem is somehow specific to the SMBv2 protocol.
>> However, I'm a Samba newbie and would welcome any tips on how to
>> extract more information from this machine/server in order to figure
>> out why SMBv2 specifically is failing.
> Can you get a wireshark trace on port 445 between client and
> server ? That would help.
There you go. I attached it to the e-mail, not sure if that's the proper 
way to send (small) files around on this list, if not please tell me :)

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