[Samba] SMB Multichannel not working?
csheehan at vestmark.com
Thu Feb 2 17:19:50 UTC 2023
Here are a few screenshots of the protocol negotiation packets between my client (172.27.252.57) and my Samba server (172.27.252.11): https://imgur.com/a/nXk3QRV
Imgur: The magic of the Internet
In the screenshots, there is an initial SMB request from the client (no capabilities specified), an SMBv2 reply from the server stating it does NOT support multi channel, a 2nd request from the client (now in SMBv2 protocol), and an SMBv2 reply from the server saying it supports multichannel. The two replies from the server contradict one another. The "Session Request" packets after the protocol negotiations show the session request did not have multichannel enabled. I suspect this is because the client saw the first protocol negotiation reply that said the server did not support multichannel and so the client did not enable multichannel in it's request for a session.
o: +1 (781) 224-7753<tel:+1%20(781)%20224-7753>
e: csheehan at vestmark.com<mailto:csheehan at vestmark.com>
This e-mail and any attachments hereto, are intended for use by the addressee(s) only and may contain information that is confidential information of Vestmark, Inc. If you are not the intended recipient of this e-mail, or if you have otherwise received this e-mail in error, please immediately notify me by telephone or by e-mail, and please permanently delete the original, any print outs and any copies of the foregoing. Any dissemination, distribution or copying of this e-mail is strictly prohibited.
From: samba <samba-bounces at lists.samba.org> on behalf of Rowland Penny via samba <samba at lists.samba.org>
Sent: Thursday, February 2, 2023 10:23 AM
To: samba at lists.samba.org <samba at lists.samba.org>
Cc: Rowland Penny <rpenny at samba.org>
Subject: Re: [Samba] SMB Multichannel not working?
This email was NOT sent from someone at Vestmark
On 01/02/2023 20:58, Carter Sheehan via samba wrote:
> Hello Jeremy,
> I looked at low-level packets captured in Wireshark and I see some interesting things happening during the SMB session negotiations
> In the packet stream, I see 4 SMB "Negotiate Protocol" request/response packets and I see 4 "session setup" packets. During the protocol negotiation, the Samba server's first reply states multi channel support is "0", the second reply says it is supported.
> Then, in the "session setup" packets, the client request does not have multichannel support enabled so the session does not utilize the feature.
> I can send you a screenshot of the wireshark capture if you have a separate email, the samba list has a max email cap so I can't send pictures
You could do what everyone else does, post them somewhere and provide a
Also I don't think a screenshot is going to do.
To unsubscribe from this list go to the following URL and read the
More information about the samba