Hi,
I have a strange problem when trying to add a new server to the pool. The error
I get is:
Invalid stratum response from 185.136.132.32 (Your server is in stratum ). Is
your server configured properly? Is public access allowed? If you just
restarted your ntpd, then it might still be stabilizing the timesources - try
again in 10-20 minutes. The server is running chrony 2.1.1 (CentOS 7.2)
However, if I run an ntpdate from my home computer it seems to be fine:
# ntpdate -q ntp.icfo.es
server 185.132.136.32, stratum 3, offset 0.004235, delay 0.05609
12 May 22:43:33 ntpdate[17730]: adjust time server 185.132.136.32 offset
0.004235 sec
On the other hand, ntpd running on the very same computer is not able to sync
to the server:
# ntpq
ntpq> lpe
remote refid st t when poll reach delay offset jitter
==============================================================================
elv06.icfo.es .INIT. 16 u - 512 0 0.000 0.000 0.000
But tcpdump does not show anything strange to me:
22:47:45.709640 IP (tos 0xc0, ttl 64, id 51825, offset 0, flags [DF], proto UDP
(17), length 76)
192.168.110.10.ntp > elv06.icfo.es.ntp: [bad udp cksum 0x70a1 -> 0xeaf4!]
NTPv4, length 48
Client, Leap indicator: (0), Stratum 2 (secondary reference), poll 8
(256s), precision -20
Root Delay: 0.016937, Root dispersion: 0.029235, Reference-ID:
hora.rediris.es
Reference Timestamp: 3672074470.726396977 (2016/05/12 22:41:10)
Originator Timestamp: 0.000000000
Receive Timestamp: 0.000000000
Transmit Timestamp: 3672074865.709530174 (2016/05/12 22:47:45)
Originator - Receive Timestamp: 0.000000000
Originator - Transmit Timestamp: 3672074865.709530174 (2016/05/12
22:47:45)
22:47:45.731292 IP (tos 0x0, ttl 53, id 11243, offset 0, flags [DF], proto UDP
(17), length 76)
elv06.icfo.es.ntp > 192.168.110.10.ntp: [udp sum ok] NTPv4, length 48
Server, Leap indicator: (0), Stratum 3 (secondary reference), poll 8
(256s), precision -20
Root Delay: 0.016403, Root dispersion: 0.019470, Reference-ID: 10.4.1.41
Reference Timestamp: 3672074611.084531992 (2016/05/12 22:43:31)
Originator Timestamp: 3672074865.709530174 (2016/05/12 22:47:45)
Receive Timestamp: 3672074865.732747912 (2016/05/12 22:47:45)
Transmit Timestamp: 3672074865.732886850 (2016/05/12 22:47:45)
Originator - Receive Timestamp: +0.023217745
Originator - Transmit Timestamp: +0.023356689
Do you have any hints of what could be wrong and how to troubleshoot?
Thanks in advance!
Gonçal
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