Allow NTP client to synchronise any stratum

lvnt · 04-19-2014, 02:57 PM

Hi,

I'm trying to sycnhronise my 2 computers each other (none of them connected to internet) One will be master and the other will be client all the time.
When i try to use ntpdate it shows me this

Code:

sudo ntpdate -dv 10.0.0.2
19 Apr 22:40:05 ntpdate[1035]: ntpdate 4.2.6p3@1.2290 Tue Mar  6 15:10:39 UTC 2012 (1)
Looking for host 10.0.0.2 and service ntp
host found : 10.0.0.2
transmit(10.0.0.2)
receive(10.0.0.2)
transmit(10.0.0.2)
receive(10.0.0.2)
transmit(10.0.0.2)
receive(10.0.0.2)
transmit(10.0.0.2)
receive(10.0.0.2)
transmit(10.0.0.2)
10.0.0.2: Server dropped: strata too high
server 10.0.0.2, port 123
stratum 16, precision -23, leap 11, trust 000
refid [10.0.0.2], delay 0.02774, dispersion 0.00027
transmitted 4, in filter 4
reference time:    00000000.00000000  Thu, Feb  7 2036  8:28:16.000
originate timestamp: d6fd5088.8e0d0b3e  Sat, Apr 19 2014 22:44:08.554
transmit timestamp:  d6fd4f9b.c79d0737  Sat, Apr 19 2014 22:40:11.779
filter delay:  0.02849  0.02774  0.02809  0.02838 
         0.00000  0.00000  0.00000  0.00000 
filter offset: 236.7734 236.7739 236.7736 236.7735
         0.000000 0.000000 0.000000 0.000000
delay 0.02774, dispersion 0.00027
offset 236.773934

I've read on the internet that it means the server is not synchronised so it puts itself on stratum 16 so the client cannot synchronise itself to the master.

I want my client to synchronise the master no matter its stratum is. How can i achieve this?

thanks.

michaelk · 04-19-2014, 04:24 PM

Typically desktop ntp configurations are set to use the system clock when it can not sync to a time server. The undisciplined local clock driver is set to stratum 16. Just set it to 1.

http://doc.ntp.org/4.2.0/drivers/driver1.html

lvnt · 04-19-2014, 04:35 PM

thank you very much. It worked !

I have one more question now. On my client computer I'm using chrony for ntp. The client computer doesn't have a real time clock so everytime I reset it, its time resets to 1970. However my master computer is a laptop and its time keeps going on 2014. So the client computer should do a immediate time jump when it is connected to a network.

Can you also help me on this?

michaelk · 04-20-2014, 09:52 AM

I assume you are running ntpdate from the client so why not use that to force a time sync.