Hallo,
we have our own ntp-server which is running Ubuntu 14.04.LTS.
This Server works fine:
ntpq -pn
remote refid st t when poll reach delay offset jitter
==============================================================================
*178.63.9.110 129.69.1.153 2 u 56 128 377 22.658 0.249 0.053
-85.214.38.116 192.53.103.108 2 u 54 128 377 2.101 -5.105 0.051
+37.58.57.238 192.53.103.103 2 u 50 128 377 20.971 0.839 0.114
+94.130.76.108 192.53.103.108 2 u 56 128 377 24.007 -1.009 0.163
But on our Debian Strech server they all got Stratum16 and doesn't sync:
ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
timeserv.domain.ag .INIT. 16 u - 1024 0 0.000 0.000
0.000
In Debian Jessie (and the same configuration/network) it works fine and get a
Stratum3, also an 'ntpdate timeserv.domain.ag' works on Debian Stretch.
The firewall is not a problem, because with nmap and ntp-script it works fine:
nmap -sU -p 123 --script ntp-info timeserv.domain.ag
Starting Nmap 7.40 ( https://nmap.org ) at 2019-02-26 09:25 CET
Nmap scan report for timeserv.domain.ag (194.94.xxx.xxx)
Host is up (0.00017s latency).
PORT STATE SERVICE
123/udp open ntp
| ntp-info:
| receive time stamp: 2019-02-26T08:26:05
| version: ntpd 4.2.6p5@1.2349-o Fri Jul 6 20:19:54 UTC 2018 (1)
| processor: x86_64
| system: Linux/3.13.0-161-generic
| leap: 0
| stratum: 3
| precision: -20
| rootdelay: 31.589
| rootdisp: 42.723
| refid: 178.63.9.110
| reftime: 0xe01f73ce.3608c5f7
| clock: 0xe01f768f.e9bd2105
| peer: 57654
| tc: 10
| mintc: 3
| offset: 0.008
| frequency: 27.593
| sys_jitter: 1.020
| clk_jitter: 0.180
|_ clk_wander: 0.014\x0D
Service Info: OS: Linux/3.13.0-161-generic
Nmap done: 1 IP address (1 host up) scanned in 13.75 seconds
and it also looks like that the client try to query the tnp-server because I
can find the IP-Address of the Server under the section 'private clients':
nmap -sU -pU:123 -Pn -n --script=ntp-monlist timeserv.domain.ag
Can somebody help me with this issue?
Thanks in advance!
best regards stefan
Stefan
