TCP retransmission
Dave Viner
daveviner at yahoo.com
Thu Nov 1 16:59:48 GMT 2007
I apologize for the post to the -technical list. But, no one on the
general list seems able to help me. I have been debugging this issue
for a week with no solutions evident. Any help or guidance you could
provide would be AWESOME.
I am seeing a ton of TCP retransmissions for Session Setup AndX
responses. Here's what the communication looks like in ethereal (.
233 is the windows client, .14 is the samba server):
.233 -> .14 Negotiate protocol request
.14 -> .233 Negotiate protocol response
.233 -> .14 Session Setup AndX Request
.14 -> .233 Session Setup AndX Response
.233 -> .14 Session Setup AndX Request
.14 -> .233 Session Setup AndX Response
.233 -> .14 Tree Connect And X Request [frame 1799]
.14 -> .233 [RETRANSMIT] Session Setup AndX Response
.233 -> .14 [DUP ACK 1799#1] 1046 > microsoft-ds
.14 -> .233 [RETRANSMIT] Session Setup AndX Response
.233 -> .14 [DUP ACK 1799#2] 1046 > microsoft-ds
.14 -> .233 [RETRANSMIT] Session Setup AndX Response
.233 -> .14 [DUP ACK 1799#3] 1046 > microsoft-ds
.233 -> .14 [RETRANSMIT] Tree Connect And X Request [frame 1812]
.14 -> .233 [RETRANSMIT] Session Setup AndX Response
.233 -> .14 [DUP ACK 1812#1] 1046 > microsoft-ds
.233 -> .14 [RETRANSMIT] Tree Connect And X Request [frame 1823]
.14 -> .233 [RETRASMIT] Session Setup AndX Response
.233 -> .14 [DUP ACK 1823#1] 1046 > microsoft-ds
.233 -> .14 [RETRANSMIT] Tree Connect And X Request [frame 1840]
.14 -> .233 [RETRASMIT] Session Setup AndX Response
.233 -> .14 [DUP ACK 1840#1] 1046 > microsoft-ds
.233 -> .14 [RETRANSMIT] Tree Connect And X Request [frame 1868]
.14 -> .233 [RETRASMIT] Session Setup AndX Response [frame 1877]
.233 -> .14 [DUP ACK 1868#1] 1046 > microsoft-ds
.233 -> .14 Echo Request
.14 -> .233 [DUP ACK 1877#1] 1046 > microsoft-ds
.233 -> .14 [RETRANSMIT] Tree Connect And X Request
.14 -> .233 [ACK] microsoft-ds > 1046
.14 -> .233 Tree Connect And X Response
.14 -> .233 Echo Response
.233 -> .14 [ACK] 1046 > microsoft-ds
.233 -> .14 NT Create AndX Request
.14 -> .233 NT Create AndX Response
.. snip ..
After the snip, everything is fine. All traffic flows normally,
everything is perfect. From the client, I can browse the shares,
open, read, and write files, etc.
I am *very* confused why the identical requests would require so many
retransmissions the first time, but then work fine.
I can reproduce this problem at will.
I posted this problem and the general outline of the issue at http://
thread.gmane.org/gmane.network.samba.general/93740
If this requires more in-depth discussion, I am happy to speak to
anyone about this issue. I can even bring to bear some consulting
budgets to solve this issue, but only if it's solved quickly.
Thanks
Dave Viner
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