All those duplicate ACKs look like a problme to me... I would be inclined to capture from the other end or from a monitor port on the switch to make sure those are actually hitting the wire. The only explination I can think of is that the system sending the duplicate ACKs is assuming that it's lost a segment for some reason and is trying to trigger fast recovery early.
Stephen Hurd schrieb am 18.02.2010 17:18 (localtime): ...
one retransmit per five packets). Is this what you're seeing? If you have a capture you could share covering a few seconds, I could take a look and provide a better opinion.
Thanks for your help, here's a small snippet of the iperf session. There are hundreds od duplicate ACKs. I'm not sure how to understand that. Like mentioned, I have to refresh some TCP basics before I can do usefull tests. But perhaps you can confirm that this behaviour is intendend, or where the problem could be...
Thanks, -Harry
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