[ntp:questions] Re: NTP Server not responding to clients
me at privacy.net
Thu Aug 7 17:37:04 UTC 2003
> Apologies for the verbosity, but it's sort of required for this one, I
> I've got an NTP server that is not responding to client requests for
> timesync. Here's the scoop:
> As you can see here, this server is able to reach all of its servers
> and its peers just fine:
> [root at servermachine log]# ntpq -p
> remote refid st t when poll reach delay offset
> LOCAL(0) LOCAL(0) 10 l 4 64 377 0.000 0.000
> foo.stratum1.co 0.0.0.0 1 u 16 64 377 0.000 0.000
> bar.stratum1.co 0.0.0.0 1 u 60 64 377 0.000 0.000
> foo.stratum2.co 0.0.0.0 2 u 1 64 377 71.070 -1.707
> bar.stratum2.co 0.0.0.0 2 u 28 64 377 0.000 0.000
> baz.stratum2.co 0.0.0.0 2 u - 64 0 0.000 0.000
I don't think you're reading that right. With no refid you've not
reached it. You should see at least one line starting with a * to
While you may have no firewall rules on that system, either you've
picked a range of hosts that aren't responding, you've got a routing
problem or something is filtering 123/UDP.
> *THE PROBLEM*
> Even though servermachine is able to sync with it's servers OK, none
> of our network clients are able to sync with servermachine. As you can
> see from the tcpdump below, the client NTP packets are arriving OK,
> but servermachine just IGNORES them completely. No response is sent to
> the client. No record is left in /var/log/messages.
Because it's not synchronised itself. Until it's got a sync it won't
Rob MacGregor (BOFH) Oh my God! They killed init! You bastards!
The light at the end of the tunnel is an oncoming dragon.
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