I have seen the same behavior in iperf before. Out-of-order and/or lost
packets, but UDP transmissions with DVTS or CXP worked very well. If memory
serves, playing around with some of the settings (especially the -w parameter)
seemed to improve things - but we could never get it to work properly. I also
used wireshark to confirm and got similar results to you. If I can find any
notes on this issue later will post them here.
José
From: Wichai Komentrakarn [mailto:wicha...@gilat.th.com]
Sent: Sunday, February 14, 2010 7:52 PM
To: iperf-us...@dast.nlanr.net
Subject: [Iperf-users] Iperf UDP Packet Loss
Hi,
I am trying to use the Iperf to analyze UDP packet loss on a network. I saw
Iperf reported several % packet loss but when I used Wireshark to capture the
sent and received packets and compared them. I couldn't see any packets loss on
the received side. Can you explain how Iperf reported percentage of packet loss
or what is the condision that Iperf decided it didn't recieve a UDP packet.
I have the WireShark captures on the sender side and receiver side and I can
see all packets were received. Note, the captures on the received side is done
on the receiver PC itself. I also use WireShark to print all hexes of these
packets into text files and I used text editor to compare the files, I could
see only the first 32 bytes (MAC address, IP TTL and IP header checksum) are
differenct between the sender side and recevier side which is normal.
The Iperf is version 1.7.0 for Win32.
Thanks for your advise in advance.
Regards,
Wichai
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