[cifs-protocol] [EXTERNAL] MS-SMB2 over QUIC and usage of QUIC streams - TrackingID#2503280040007778

[Kristian Smith]

[DocHelp to Bcc]

Hi Metze,

Thanks for reaching out with your questions regarding QUIC in MS-SMB2. Case 2503280040007778 has been created for your inquiries and one of our engineers will respond soon.

Regards,
Kristian Smith
Support Escalation Engineer | Microsoft® Corporation
Email: kristian.smith at microsoft.com

-----Original Message-----
From: Stefan Metzmacher <metze at samba.org> 
Sent: Friday, March 28, 2025 12:11 AM
To: Interoperability Documentation Help <dochelp at microsoft.com>
Cc: cifs-protocol at lists.samba.org
Subject: [EXTERNAL] MS-SMB2 over QUIC and usage of QUIC streams

Hi DocHelp,

in MS-SMB2 I can't find any hint on the usage about streams with a QUIC connection.

 From captures I see that a Windows client uses stream id 0.
And from various talks and discussions at conferences it seems to be clear that only a single stream is used.

But I'm wondering what happens if a peer creates additional streams. How does a Windows client behave if that happens?
Will these be ignored?
Will the whole QUIC connection be terminated?
Will the stream id being ignored?
Does a Windows Server only accepts clients using stream id 0?

It would be good to have this documented.

Thanks!
metze