Re: ntp and dynamic IP

From: Ricardo Yanez (Ricardo.Yanez_at_correo.calel.cl)
Date: 06/30/05

  • Next message: Kent West: "Re: Now you see it, now you don't--the tale of the disappearing mouse..." 
    To: schnobs@babylon-kino.de
Date: Thu, 30 Jun 2005 09:00:54 -0400

    >
    > my ISP disconnects me once a day, so that I won't keep a quasi-static IP
    > I don't pay for. Now, pppd reconnects swiftly, but ntp doesn't seem to
    > like this anyway. Soon after the dis-/reconnect I get this:

    > Feb 9 13:15:01 zwerg ntpd[4732]: sendto(192.53.103.104): Invalid argument
    > Feb 9 13:15:07 zwerg ntpd[4732]: sendto(130.149.17.21): Invalid argument
    > Feb 9 13:16:08 zwerg ntpd[4732]: sendto(195.145.119.188): Invalid argument
    > Feb 9 14:41:27 zwerg ntpd[4732]: synchronisation lost

    > As it will never recover, I resorted to restarting ntp every day. But
    > surely, there's a more elegant solution. Or is there?

    Hi,
    An elegant (I think) way of solving this is to
    put scripts in /etc/ppp/ip-[up|down].d/ to stop
    and start ntpd when pppd reconnects.

    My /etc/ppp/ip-down.d/ntp-server simply says,

    -----
    #!/bin/sh

    [ -x /usr/sbin/ntpd ] || exit 0

    echo "Stopping NTP server"
    /etc/init.d/ntp-server stop
    -----

    and my /etc/ppp/ip-up.d/ntp-server,

    -----
    #!/bin/sh

    [ -x /usr/sbin/ntpd ] || exit 0

    echo "Starting NTP server"
    /etc/init.d/ntp-server start
    -----

    Just make sure these scrips are executable (755).

    Ricardo 

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