Re: I want to force 1/2 duplex from my network card. How?

From: Gilbert Sebenste (sebenste_at_weather3.admin.niu.edu)
Date: 03/30/04

  • Next message: Alexander Dalloz: "Re: No internet connection" 
    Date: Tue, 30 Mar 2004 10:51:03 -0600 (CST)
To: For users of Fedora Core releases <fedora-list@redhat.com>

    On Tue, 30 Mar 2004, Andre Costa wrote:

    > Hi Gilbert,
    >
    > On Tue, 30 Mar 2004 10:18:13 -0600 (CST)
    > Gilbert Sebenste <sebenste@weather3.admin.niu.edu> wrote:
    >
    > > Hello all,
    > >
    > > Subject says it all. Auto-detect is giving me full duplex, but it
    > > should really be 1/2 duplex. Redhat-config-network* doesn't do
    > > anything for me to solve this. I want this to be "hard-coded", if you
    > > will. Thanks for any advice. Running FC1, fully patched...
    >
    > First, you should provide at least some info about your network card...

    Sorry, my bad. It is a Syskonnect SK-98xx (subvariant) Gigabit ethernet
    card. It is currently running 100 MB full duplex.

    > anyway, what you probably need is some module parameters (assuming NIC
    > support is configured as a module on your system).
    >
    > eg. here with my nForce2 chipset, nvnet allows the following parameters:
    >
    > # modinfo nvnet
    > filename: /lib/modules/2.4.22-1.2174.nptlcustom/kernel/drivers/net/nvnet.o
    > description: "NVIDIA Corporation NVNET Ethernet Driver Version1.0.5 March 24, 2003"
    > author: "NVIDIA (linux-nforce-bugs@nvidia.com"
    > license: "NVIDIA"
    > parm: speed int, description "Control speed by setting 0 for auto, 1 for 10 Mbps and 2 for 100 Mbps"
    > parm: duplex int, description "Control duplex by setting 0 for auto, 1 for half and 2 for full"
    > parm: optimization int, description "Control optimization by setting 0 for Throughput, 1 for CPU"
    >
    > You could then provide the above params (speed, duplex, optimization) on
    > the /etc/modules.conf file. Maybe something similar can be done for your
    > network card module.

    Hmmm. I'm scared to try this out since I frankly admit I have no idea what
    I am doing.

    Alexander Dolloz wrote:

    > Please do not hijack foreign threads. Posting a new subject mail to the
    > list please use an empty mail editor window and do not take a foreign
    > posting. Else the mail contains a misleading reference to an unrelated
    > topic - like your post now.

    How is this unrelated? I described the problem, and then went into detail.
                                                                                                                                                               
    >To you problem: use either ethtool or mii-tool to force half duplex
    >mode.
    >
    >Alexander

    %ethtool -s eth1 duplex half
    Cannot get current device settings: Operation not supported not setting
    duplex

    Hmmm. OK, what am I doing wrong here?

    *******************************************************************************
    Gilbert Sebenste ********
    (My opinions only!) ******
    Staff Meteorologist, Northern Illinois University ****
    E-mail: gilbert@niu.edu ***
    web: http://weather.admin.niu.edu **
    Work phone: 815-753-5492 *
    ******************************************************************************* 

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