Igor Zlatkovic
2009-Feb-25 11:28 UTC
[Samba] Excessive and useless SMB queries by XP client
Hi there,
Samba server is 3.0.28a on Ubuntu 8.04. I connect to the server through
OpenVPN (using TUN). OpenVPN and Samba servers are on the same machine.
Using Windows XP client and the builtin Windows Explorer as file manager
I just traverse a share on the server, changing directories and
displaying their contents.
Basically it works, but quite often there are significant delays before
the contents of a directory is displayed. I have seen network activity
during those delays and recorded the traffic with Wireshark. The
interesting part of the trace is attached.
The attachment shows that the client queries info of a directory named
"test" on the share (which exists), then tries to access an alternate
data stream named \test:{4c8cc155-6c1e-11d1-8e41-00c04fb9386d}:$DATA
(which does not exist). Annoying thing is that the client repeats
exactly the same queries several hundred times before giving up and
displaying the contents of the directory. The whole network log repeats
exactly the same sequence from the attached file several hundred times,
only the FID is different every time.
If I use a Linux client, this does not happen. If I use Windows XP
client with any other file manager except for the builtin Windows
Explorer, this does not happen either. This happens only when using
Windows Explorer, on three different Windows XP clients, absolutely
reproducible.
According to the network logs, I see no wrong done by Samba, neither do
I see any problem with the network connection. Problems with MTU would
cause dropped packets and errors, but this is not the case. everything
works, no errors are reported, just there are delays during which
excessive SMB queries made by the client can be seen.
I am quite certain that the client is misbehaving. Still I write to this
list in hope that someone has seen this before and knows what is amiss
with the client.
Ciao,
Igor
-------------- next part --------------
60 105.343838 10.8.0.10 10.8.0.1 SMB NT Create AndX Request, Path: \test
61 105.379199 10.8.0.1 10.8.0.10 SMB NT Create AndX Response, FID: 0x32fe
62 105.379854 10.8.0.10 10.8.0.1 SMB Trans2 Request, QUERY_FILE_INFO, FID:
0x32fe, Query File Basic Info
63 105.420342 10.8.0.1 10.8.0.10 SMB Trans2 Response, FID: 0x32fe,
QUERY_FILE_INFO
64 105.420701 10.8.0.10 10.8.0.1 SMB Trans2 Request, QUERY_FILE_INFO, FID:
0x32fe, Query File Standard Info
65 105.459627 10.8.0.1 10.8.0.10 SMB Trans2 Response, FID: 0x32fe,
QUERY_FILE_INFO
66 105.459973 10.8.0.10 10.8.0.1 SMB Trans2 Request, QUERY_FILE_INFO, FID:
0x32fe, Query File Internal Info
67 105.497540 10.8.0.1 10.8.0.10 SMB Trans2 Response, FID: 0x32fe,
QUERY_FILE_INFO
68 105.497732 10.8.0.10 10.8.0.1 SMB Trans2 Request, QUERY_FILE_INFO, FID:
0x32fe, Query File EA Info
69 105.533927 10.8.0.1 10.8.0.10 SMB Trans2 Response, FID: 0x32fe,
QUERY_FILE_INFO
70 105.549305 10.8.0.10 10.8.0.1 SMB NT Create AndX Request, Path:
\test:{4c8cc155-6c1e-11d1-8e41-00c04fb9386d}:$DATA
71 105.589626 10.8.0.1 10.8.0.10 SMB NT Create AndX Response, FID: 0x0000,
Error: STATUS_OBJECT_PATH_NOT_FOUND
72 105.590081 10.8.0.10 10.8.0.1 SMB Close Request, FID: 0x32fe
73 105.622875 10.8.0.1 10.8.0.10 SMB Close Response, FID: 0x32fe