pppd giving error with 2.4.18 kernel, everything OK with 2.4.7 kernel

Discussion in 'Linux Networking' started by vasanta, Sep 17, 2004.

  1. vasanta

    vasanta Guest

    Moving all of our modules from 2.4.7 to 2.4.18, I have this strange
    problem with PPPd, I can run this pppd on 2.4.7 card, but on 2.4.18
    card, whenever the pppd is started, I am getting the following error
    (we are passing this device "/dev/tts/T0" to pppd in silent mode).

    Failed to reopen /dev/tts/T0

    This error is coming from pppd/tty.c file, otherthing I can see is the
    modem variable value is changing to '0' in 2.4.7, but this is not
    changing to '0' from 1 in 2.4.18. Do I have to change anything else in
    2.4.18 to make the daemon work.

    I did a small workaround, changing modem=0 before reopen, then it is
    not reopening, but I am getting one more below error.

    pppd: Couldn't set tty to PPP discipline: Invalid arguement.

    Thanks in advance, appreciated.
    vasanta, Sep 17, 2004
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  2. There is much said above that is not clear to me, as well as in the
    rest of your post. But you should only be using non-negative integers
    to specify a serial device file, not something like "T0" .
    That is about as clear as mud to me, so my response may be way off-base.

    The pppd "modem" option is set (to 1) by default. If you have a serial
    device and don't want to use modem control lines then use the pppd option
    "local" . If you are using a pty then modem is automatically reset to
    0 by pppd (in tty.c). There should be no need to muck with tty.c or
    the kernel code.
    Perhaps pppd can't set the tty to PPP discipline after the "small
    workaround" because the tty is not open when the change in line
    discipline is attempted (in sys-linux.c).
    Clifford Kite, Sep 19, 2004
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