Pardon my intrusion, but I've had a very similar problem within out small office network. Are you certain that the problem lies on the internet side? I have spent hours trying to track down the issue and have now concluded that it is an errant driver on one machine that is causing the problem. Initially I suspected several other things, but persistent testing has pinpointed our problem to a single PC. File copies of a 100MB file FROM that machine to any other machine takes well over 5 minutes. In safe mode with only two nodes active that same copy takes about 15 seconds. I have additional testing ahead to try to identify the specific driver, but I believe the end is in sight and its not what I originally believed it would be. Good luck.
_____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Roland Volz Sent: Monday, June 04, 2007 1:11 PM To: wireshark-users@wireshark.org Subject: [Wireshark-users] TCP Dup Ack I have a couple of customers that have been complaining of issues on their circuits, an issue that causes them to have problems with large file transfers. The only noteworthy problems in their data streams seem to be TCP Dup Acks - I've seen as many as sixty, or over a hundred, in file transfers of 100 MB test files. However, as near as I can determine, these errors are being introduced in the Internet, outside of our network (the customers use VPNs over internet circuits with major carriers for these file transfers). As I said, we've tested our own network thoroughly, but I'm at a loss as to where to go with this issue. Obviously, telling the customer, "It's not our fault" is unacceptable, as that doesn't move them any closer to error-free file transfers. On the other hand, I'm not sure where to tell the carriers' help desk technicians to look for the source of this issue. Has anyone seen this before on Internet circuits, and is there some way I can use Wireshark to help pinpoint the issue more specifically than telling the carrier, "It's in your cloud"? Thanks, Roland Volz Network Engineer Data Access/Datapatch, Inc. 40 Eisenhower Drive Paramus, NJ 07652-1404 (201) 843-5468 x7032 <http://www.Data-Access.com> www.Data-Access.com
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