Re: [chrony-users] can not sync with vmware ntp server

[Thomas Aichinger <taich@xxxxxx>]

Am 06.06.2017 um 13:24 schrieb Miroslav Lichvar:
> On Tue, Jun 06, 2017 at 01:18:25PM +0200, Thomas Aichinger wrote:
> > Am 06.06.2017 um 12:13 schrieb Miroslav Lichvar:
> > > The chrony config looks ok. Is there a firewall which drops packets
> > > that don't have source port equal to 123? Does the ntpd server use the
> > > orphan mode?
> > >
> > > Seeing output of "tcpdump -v port 123" on the client might help.
> > There is no firewall.
> >
> > The same client gets sync with "ntpq -p" but not with "chronyc sources"
> > The esx server does not use orphan mode
> >
> > According to tcpdump chrony sends requests to esx but does not get any
> > answer from esx.
> > But ntp does. Here is a dump.
> That is odd. Can you please try to add "acquisitionport 123" to
> chrony.conf and see if it helps? That will make it use source port 123
> like ntpd does. If that helps, it must be something with the
> networking configuration.
"acquisitionport 123" - did it !!!

14:21:24.223236 IP6 (flowlabel 0x7c2ea, hlim 64, next-header UDP (17) 
payload length: 56) sinalco.ntp > esx1.ntp: [bad udp cksum 0x88f3 -> 
0x9fd2!] NTPv4, length 48
        Client, Leap indicator:  (0), Stratum 3 (secondary reference), 
poll 2 (4s), precision -20
        Root Delay: 0.008666, Root dispersion: 0.026153, Reference-ID: 
169.230.22.45
          Reference Timestamp:  3705740480.215908975 (2017/06/06 14:21:20)
          Originator Timestamp: 3705740480.216002245 (2017/06/06 14:21:20)
          Receive Timestamp:    3705740480.216178975 (2017/06/06 14:21:20)
          Transmit Timestamp:   3705740484.223203916 (2017/06/06 14:21:24)
            Originator - Receive Timestamp:  +0.000176729
            Originator - Transmit Timestamp: +4.007201670
14:21:24.223609 IP6 (class 0xb8, hlim 63, next-header UDP (17) payload 
length: 56) esx1.ntp > sinalco.ntp: [udp sum ok] NTPv4, length 48
        Server, Leap indicator:  (0), Stratum 2 (secondary reference), 
poll 3 (8s), precision -20
        Root Delay: 0.008163, Root dispersion: 0.026168, Reference-ID: 
130.187.221.250
          Reference Timestamp:  3705739540.020842120 (2017/06/06 14:05:40)
          Originator Timestamp: 3705740484.223203916 (2017/06/06 14:21:24)
          Receive Timestamp:    3705740484.223443045 (2017/06/06 14:21:24)
          Transmit Timestamp:   3705740484.223461011 (2017/06/06 14:21:24)
            Originator - Receive Timestamp:  +0.000239129
            Originator - Transmit Timestamp: +0.000257094

Thanks for your great help.


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