OK guys, so I have public NTP server, and it was installed on Fedora 30. I needed to change to Ubuntu, so I made new configuration to Ubuntu 18.04.3 LTS. But here is the thing, I installed the NTP, and no matter what NTP servers I am choosing, it is OK for a 3-4 minutes, and then I can see with ntpq -p that somehow the sync servers are changed with only this:
remote: 51.105.208.173
refid: 25.66.230.4
This is third day that I am struggling… Here is my config file. I am lost, I will appreciate any help.
# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help
driftfile /var/lib/ntp/ntp.drift
Leap seconds definition provided by tzdata
leapfile /usr/share/zoneinfo/leap-seconds.list
Enable this if you want statistics to be logged.
statsdir /var/log/ntpstats/
statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable
Specify one or more NTP servers.
Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
more information.
server ntp.bsdbg.net iburst
server ptbtime1.ptb.de iburst
server zeit.fu-berlin.de iburst
server ntp0.fau.de iburst
Use Ubuntu’s ntp server as a fallback.
pool ntp.ubuntu.com
Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
details. The web page http://support.ntp.org/bin/view/Support/AccessRestrictions
might also be helpful.
Note that “restrict” applies to both servers and clients, so a configuration
that might be intended to block requests from certain clients could also end
up blocking replies from your own upstream servers.
By default, exchange time with everybody, but don’t allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery limited
restrict -6 default kod notrap nomodify nopeer noquery limited
Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1
Needed for adding pool entries
restrict source notrap nomodify noquery
Clients from this (example!) subnet have unlimited access, but only if
cryptographically authenticated.
#restrict 192.168.123.0 mask 255.255.255.0 notrust
If you want to provide time to your local subnet, change the next line.
(Again, the address is an example only.)
#broadcast 10.100.100.255
If you want to listen to time broadcasts on your local subnet, de-comment the
next lines. Please do this only if you trust everybody on the network!
#disable auth
#broadcastclient
#Changes recquired to use pps synchonisation as explained in documentation:
#http://www.ntp.org/ntpfaq/NTP-s-config-adv.htm#AEN3918
#server 127.127.8.1 mode 135 prefer # Meinberg GPS167 with PPS
#fudge 127.127.8.1 time1 0.0042 # relative to PPS for my hardware
#server 127.127.22.1 # ATOM(PPS)
#fudge 127.127.22.1 flag3 1 # enable PPS API’