[cifs-protocol] BKRP question/response
Nick.Meier at microsoft.com
Wed Sep 29 15:58:29 MDT 2010
* So basically there is no obligation for the client to try to downgrade from version 3 to version 2 right ?
Correct - the client is not required to try a different version,
and there are no requirements as to which version the client
should try first.
* What is the behavior of the windows client ?
Not sure, but we can look into this.
* Can you tell us the information if so can it be added as a behavior note ?
Unlikely. Windows behavior notes are for when Windows deviates
from the protocol. When we look into the previous question, if
we find that Windows deviates from the protocol, we will add a
I spoke with Bryan and we can look into the possibility of documenting
a high level description in a forum less formal than the protocol
documents. A blog or a KB article come to mind.
Based on my review of the document, if I was writing a client, I would implement both v2 and v3. I would have the client try v3 first and then drop back to v2. I would also allow for the disabling of one of the versions (but not both) for versatility/performance in known environments.
From: Matthieu Patou [mailto:mat at samba.org]
Sent: Wednesday, September 29, 2010 11:11 AM
To: Nick Meier; cifs-protocol at samba.org
Subject: Re: BKRP question/response
On 29/09/2010 20:45, Nick Meier wrote:
> Good Morning Matthieu,
> The follow are my findings after reviewing the MS-BKRP document.
> BKRP defines two version, v2 and v3. If a server does not support the version requested by the client, how should the client behave?
> Older versions of Windows support v2, newer versions of windows supports v2 and v3.
> Section 18.104.22.168.4 provides a number of points.
> Point 2: If the dwVersion is not supported by the server, the server should return
> Also, the server must support at least one of the versions.
I read this from the server point of view.
> So, if a client tries one version and ERROR_INVALID_PARAMETER is returned, the client is free to try another version if the client supports multiple versions (and the alternate version is enabled on the client).
So basically there is no obligation for the client to try to downgrade from version 3 to version 2 right ? What is the behavior of the windows client ?
Can you tell us the information if so can it be added as a behavior note ?
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