NTP-server with incorrent time and with stratum 1-3

PIKNIK · 08-06-2015, 08:02 AM

Hello!

I need help with configure NTP-server on Ubuntu-server 14.04. But this ntp-server should issue not real UTC and UTC less on 1 hour. Wherein this server it should be with low stratum (1-3), otherwise clients refuses sync for this server.

The time on this server is set manually.

I tried configure so:

Code:

server 127.127.0.1
fudge 127.127.0.1 stratum 1

... and so:

Code:

server 127.127.0.1 iburst
fudge 127.127.0.1 stratum 1

... but clients see, what this server have too many big stratum (16) and do not sync.

I tried to wait, but nothing changed.

Please, see:
Have you ever seen this?
How to up NTP-server with manually time?

Thanks for help.

MensaWater · 08-06-2015, 08:35 AM

Why not use UTC for NTP and just have the servers use local timezone files to DISPLAY the time for the zone format you want?

PIKNIK · 08-06-2015, 09:01 AM

Hello, MensaWater.

Cliens this NTP-server have the following features:

1. This is not linux-system;
2. Him not have admin-access (password overdue);
3. Without admin-password must not enter localtime manually, but can start/stop ntp-client and change ntp-servers list;
4. All this clients worked only if localtime is UTC -1 hour from realtime;
5. All this clients geographically remote.

Generally change time without physical access is only possible by this method.

PIKNIK · 08-07-2015, 09:35 AM

Anyone?

michaelk · 08-07-2015, 11:11 AM

Not enough information to say. What type of system is the client?

ntp is smart enough that you can not arbitrarily change time on server by a significant amount without the client detecting it as bad. In addition the client can detect if the server is not stable enough and also detect it as bad.

Restarting the server then the client may or may not work depending on how the client is configured. According to your second post this is not an option but you may be forced to stop ntp on the client, change time manually and then restart the client's ntp.

PIKNIK · 08-14-2015, 03:00 AM

I configured NTP-server, how I planned.

The whole week configured and tested stratim command "ntpdate -q 127.0.0.1". Help me full clearing config file the NTP-server and enter this settings:

Code:

# Use the local clock
server 127.127.1.0 prefer
fudge  127.127.1.0 stratum 10


driftfile /var/lib/ntp/drift
broadcastdelay 0.008

# Give localhost full access rights
restrict 127.0.0.1

# Give machines on our network access to query us
restrict 0.0.0.0 mask 0.0.0.0 nomodify notrap

Do not stratum 3, but for NTP-clients this enough. Now my stratum on NTP-server 11 and this is good.

Thanks for help!

P.S.
Above all on this NTP-server I settinged hardclock by command # hwclock --systohc --utc . I have no idea helped this me or not, but I documenting this ther. Just in case.