High UDP Loss issues

From: Company 2210 (company2210_at_hotmail.com)
Date: 08/16/03

  • Next message: Archie Cobbs: "Re: java and mysql on FreeBSD" 
    To: <freebsd-net@freebsd.org>
Date: Sat, 16 Aug 2003 17:58:04 +0100

    Hi,
        I have two FreeBSD 5.0-RELEASE boxes connected over an IPSEC (With racoon) wireless link ( both are gateways). Now, TCP traffic flows perfectly, and at the expected speeds ~4.2Mbps. However UDP traffic flows at 10.6Mbps with enormous loss. An output from netperf is shown below:

    $ ./netperf -f K -H 10.0.0.2 -t UDP_STREAM
    UDP UNIDIRECTIONAL SEND TEST to 10.0.0.2
    Socket Message Elapsed Messages
    Size Size Time Okay Errors Throughput
    bytes bytes secs # # KBytes/sec

      8192 8192 10.00 13084 416919 10462.48
     42080 10.00 9 7.20

    I've tried playing with the MTU on both boxes (network cards and gif tunnel interfaces are set to 1500), but it has made no difference. Now, this is where the plot thickens, I have a second wireless link which connects to a Windows XP box (Layout below):

    FREEBSD-BOXA <----------IPSEC--------> FREEBSD-BOXB <------Unencrypted Wireless Link------> Windows XP - BOX

    When I run netperf from the Windows XP box to FreeBSD BOXB I get no UDP errrors:

    C:\PROGRA~1\NETPERF>netperf -f K -H 81.19.79.1 -t UDP_STREAM
    UDP UNIDIRECTIONAL SEND TEST to 81.19.79.1
    Socket Message Elapsed Messages
    Size Size Time Okay Errors Throughput
    bytes bytes secs # # KBytes/sec

      8192 8192 10.00 1465 0 1172.00
     42080 10.00 9 7.20

    C:\PROGRA~1\NETPERF>

    I am totally at a loss as to why all UDP traffic between the freebsd boxes has an ultra high error rate, but all other traffic doesn't. I'm guessing it may be a flow control issue? but I'm not sure how this could be rectified. Any help greatly appericated.

    Colin.
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  • Next message: Archie Cobbs: "Re: java and mysql on FreeBSD"

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