Date: Tue, 2 Apr 2002 09:19:06 -0500 From: Bob Drzyzgula <bob@drzyzgula.org> Message-ID: <20020402091906.D2697@www2> Subject: Re: [suse-sparc] ntp
On Tue, Apr 02, 2002 at 12:50:38PM +0200, Ng, Yatsen wrote:
>
> Hello there,
>
> I've edited ntp.conf and I'm able to reach the timeserver fine:
>
> ##
> ## Outside source of synchronized time
> ##
> server xx.xx.xx.xx # IP address of server
It is usual to also include the following lines:
server 127.127.1.0 # local clock
fudge 127.127.1.0 stratum 10
So as to give ntp a local reference in case
the remote servers aren't talking to you,
or during startup.
> ##
> ## Miscellaneous stuff
> ##
>
> driftfile /etc/ntp.drift # path for drift file
>
> [spawn:~]# ntpq
> ntpq> peers
> remote refid st t when poll reach delay offset
> jitter
> ========================================================================
> ======
> bogus-131313-TS. 0.0.0.0 16 u - 64 0 0.000 0.000
> 4000.00
This means the remote server isn't talking to you.
In turn, this could be because (a) the remote server isn't
running ntpd, (b) the remote server isn't configured
to allow you as a client, (c) there is a firewall between
you and the remote server that is blocking the ntp traffic,
or (d) something else.
The firewall thing can be the hardest to diagnose, because
you might possibly be able to contact the time server
using other protocols such as telnet, ssh, http, ftp,
etc., and yet ntp will be blocked. NTP uses UDP as its
transport. Many firewalls are configured to allow a limited
set of TCP ports through, but will block all or virtualy
all UDP traffic. DNS is often the only UDP protocol allowed
through, and many times it is allowed through only via an
application-level gateway.
One other thing to note is that NTP takes a bunch of time
to start up. Make sure you give it serveral minutes to
stabilize before you decide for sure that it isn't working.
Hope this helps.
--Bob Drzyzugla
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