apm + plip problem

Discussion in 'Linux Networking' started by Thomas Boehne, Apr 13, 2004.

  1. Hello networkers,

    I am using plip to connect my desktop PC with my notebook. If I don't start
    the apmd on the notebook, everything works fine. If I start apmd on the
    notebook, I cannot connect to it any more (even ping does not work). The
    routing tables and network settings seem not to not change at all, no
    messages in syslog either. However, I can still initiate connections from
    the notebook to the desktop. After that, everything works in both
    directions again.

    I guess that the apmd somehow suspends the parallel port and activates it on
    outgoing traffic, but not on incoming traffic. There are no options that
    control the parallel port in any of the apm scripts. I am using debian
    testing on both machines.

    Any suggestions?

    Thomas Boehne
    Thomas Boehne, Apr 13, 2004
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  2. It depends what you are doing with apmd. If your laptop goes into
    suspend it maintains RAM, but cpu goes to low power and may not respond
    to network. So it is best to set apmd NOT to suspend when on AC power.

    In fact some network devices will not respond at all when reawakening from
    suspend. So for pcmcia nics, it is sometimes necessary to configure apmd
    to restart pcmcia when it resumes.
    David Efflandt, Apr 13, 2004
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  3. The problem also occurs if the laptop is on AC power all the time. I removed
    all apmd-scripts to make sure that apmd is not manipulating the network
    devices at all. The problem also occurs if I keep working on the machine
    (thus, the CPU should not be in low power mode). It's a 486 which AFAIK
    does not even have a low power mode.

    Thomas Boehne, Apr 13, 2004
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