VCs, MaxNumberVCs, SessionKey
Richard Sharpe
rsharpe at ns.aus.com
Fri Jun 28 10:15:02 GMT 2002
On Fri, 28 Jun 2002, Raghu Iyer wrote:
> Can a SMB expert help me understand how VcNumber,
> MaxNumberVCs, SessionKey are used in the SMB protocol
> with some examples and commands that can be issued
> from a NT/W2K client to a NT/W2K/Samba Server to
> experiment with.
I dodn't think it is used, except with Terminal Server-like products.
It seems to have been an attempt to allow multiple security contexts over
a single NBT session. However, it seems not well thought out, and you must
be prepared to accept multiple SessSesup&X requests in anycase, and there
is sufficient info in each SMB to keep this stuff separate (UID, MID,
etc).
> Is there a good reference that can illustrate the concepts
> behind these parameters ? I have gone through the
> CIFS mailing list on discuss.microsoft.com and have a
> very hazy idea. I have not been able to produce sessions
> where - MaxNumberVCs is > 1 OR where SessionKey
> is != 0 OR where VcNumber is != 0. So I fail to appreciate
> under what circumstances these parameters change.
They are not discussed, except in passing, in CIFS-TR-1.0. If you do a
goodle search on SMB VCnumber or some such, you will find some discussion.
If you or anyone can send some TerminalServer traces, it would be useful.
Regards
-----
Richard Sharpe, rsharpe at ns.aus.com, rsharpe at samba.org,
sharpe at ethereal.com
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