[Samba] Samba protocol version in libsmbclient

[Jeremy Allison]

On Wed, Jun 11, 2014 at 12:11:39AM +1000, Adam Baxter wrote:
> Hi,
> What determines the protocol version that libsmbclient uses?
> 
> Changing min and max protocol version in the client smb.conf seems to have
> no effect.
> 
> I'm chasing up the performance issues I posted about earlier which may be
> caused by my Linux clients defaulting to SMB1 (via gvfsd-smb) while Windows
> happily negotiates SMB2 with the servers.
> 
> If I restrict the servers to SMB2, gvfs can't connect, while smbclient on
> the console works fine if I pass -mSMB2.
> 
> I can't see anything in
> https://git.gnome.org/browse/gvfs/tree/daemon/gvfsbackendsmb.c that would
> restrict the protocol version, either.
> 
> 
> Any ideas?

Internally the connect uses: lp_cli_maxprotocol() - see
source3/libsmb/libsmb_server.c:SMBC_server_internal()

which calls:

        status = smbXcli_negprot(c->conn, c->timeout,
                                 lp_cli_minprotocol(),
                                 lp_cli_maxprotocol());

So I think you need to set "client max protocol"
to SMB2 in smb.conf, not "max protocol" (that's
the server max protocol).

Jeremy.