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

[Thomas Aichinger <taich@xxxxxx>]

Am 06.06.2017 um 12:13 schrieb Miroslav Lichvar:
> On Tue, Jun 06, 2017 at 12:04:06PM +0200, Thomas Aichinger wrote:
> > I run an esx hypervisor with ntp v4 activated.
> > I want to use this esx as time server for all my virtual linux ubuntu
> > clients on the esx.
> >
> > When I use ntp it gets syncronized
> > When I use chrony nothing happens.
> 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.

13:04:57.303018 IP6 (class 0xb8, hlim 63, next-header UDP (17) payload 
length: 56) esx1 > sinalco.ntp: [udp sum ok] NTPv4, length 48
        Server, Leap indicator:  (0), Stratum 2 (secondary reference), 
poll 4 (16s), precision -20
        Root Delay: 0.008361, Root dispersion: 0.037734, Reference-ID: 
130.187.221.250
          Reference Timestamp:  3705734266.837861105 (2017/06/06 12:37:46)
          Originator Timestamp: 3705735897.302631049 (2017/06/06 13:04:57)
          Receive Timestamp:    3705735897.302888635 (2017/06/06 13:04:57)
          Transmit Timestamp:   3705735897.302905347 (2017/06/06 13:04:57)
            Originator - Receive Timestamp:  +0.000257585
            Originator - Transmit Timestamp: +0.000274297
13:05:15.302662 IP6 (class 0xb8, flowlabel 0xff46a, hlim 64, next-header 
UDP (17) payload length: 56) sinalco.ntp > esx1.ntp: [bad udp cksum 
0x88f3 -> 0x3036!] NTPv4, length 48
        Client, Leap indicator:  (0), Stratum 3 (secondary reference), 
poll 4 (16s), precision -24
        Root Delay: 0.008712, Root dispersion: 0.038314, Reference-ID: 
169.230.22.45
          Reference Timestamp:  3705735843.139620195 (2017/06/06 13:04:03)
          Originator Timestamp: 3705735897.302905347 (2017/06/06 13:04:57)
          Receive Timestamp:    3705735897.303018290 (2017/06/06 13:04:57)
          Transmit Timestamp:   3705735915.302622829 (2017/06/06 13:05:15)
            Originator - Receive Timestamp:  +0.000112943
            Originator - Transmit Timestamp: +17.999717482
13:05:15.303138 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 4 (16s), precision -20
        Root Delay: 0.008361, Root dispersion: 0.038009, Reference-ID: 
130.187.221.250
          Reference Timestamp:  3705734266.837861105 (2017/06/06 12:37:46)
          Originator Timestamp: 3705735915.302622829 (2017/06/06 13:05:15)
          Receive Timestamp:    3705735915.303001809 (2017/06/06 13:05:15)
          Transmit Timestamp:   3705735915.303021584 (2017/06/06 13:05:15)
            Originator - Receive Timestamp:  +0.000378979
            Originator - Transmit Timestamp: +0.000398755


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