Redhat Timeserver down? (Czornack)

[Erik P. Olsen]

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 at 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