Re: Redhat Timeserver down? (Czornack)

From: Erik P. Olsen (erik_at_epo.dk)
Date: 04/08/04

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    To: For users of Fedora Core releases <fedora-list@redhat.com>
Date: Thu, 08 Apr 2004 11:30:54 +0200

    On Wed, 2004-04-07 at 14:28, jludwig wrote:
    > On Wed, 2004-04-07 at 02:28, Erik P. Olsen wrote:
    > > ** Reply to message from jludwig <wralphie@comcast.net> on Tue, 06 Apr 2004
    > > 21:06:13 -0400
    > >
    > > > On Tue, 2004-04-06 at 18:56, Brian Bober wrote:
    > > > > Janthao wrote:
    > > > > > I'm not sure if this is a problem with my machine or with the
    > > > > > timeserver. Does anybody else have problems with clock.redhat.com?
    > > > > >
    > > > > Yes, I have that problem too, but only last couple days.
    > > >
    > > > If I remember, the ntp README, ntp protocol allows for the server to
    > > > ignore requests when heavily loaded (drop packets, sound familiar?). In
    > > > which event your machine ntpd will time out and try later at random
    > > > intervals.
    > > > Also in heavy traffic, if the sample jitter your machine receives is
    > > > more than 128mS over three seconds, the samples are discarded.
    > > > See the ntp README also man 1 ntpd
    > >
    > > It times out, you can't even ping it.
    > >
    > > --
    > > Regards,
    > > Erik P. Olsen
    > Could you ever ping it? Most firewalls don't allow pinging since this
    > can lead to a Dos attack. (From fedora.redhat.com)
    > PING www.redhat.com (209.132.177.50) 56(84) bytes of data.
    >
    > --- www.redhat.com ping statistics ---
    > 12 packets transmitted, 0 received, 100% packet loss, time 11016ms
    >

    Hm, don't really know. I pinged it when I got the synch problem and saw
    the negative response. Pinged then 4-5 other time servers all with
    positive response. Ended up selecting a server almost next door (Malmö,
    Sweden, ntp1.mmo.netnod.se). 

    -- 
Regards,
Erik P. Olsen
-- 
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