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  1. #1

    Iperf warning message meaning.

    I am using iperf packet generator tool in my project. I run iperf on FC6 system.
    In UDP transmission mode of iperf i sometimes get following warning message
    WARNING: did not receive ack of last datagram after 10 tries.

    Could anybody plz tell me what does that mean?

    Thanks in advance

  2. #2
    Same problem here. Something prevented the server end of the link from sending a reply (provide the resulting stats to the client end) even though the server end acknowledged a connection in the beginning.

    I was running in UDP mode.

    The server end is running a Linux-based firewall (iptables); I even opened up the correct incoming UDP port. While it let the connection through to the server once I opened the firewall, server seems not to be replying.

    I did the reverse where the firewall on the server end was a Netgear FVS-something, and it works fine. But I am also running different versions of iperf so this could be a problem.

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