[ntp:questions] Peering doesn't work

Mike Hauth mhauth at gmail.com
Wed Dec 15 12:41:13 UTC 2010


Hi everybody

i've got a problem with my ntp configuration.

In my infrastructure i have two servers and a couple of clients.
In normal case the servers should synchronize to 2 external time servers.

In other cases, if the external network is not available on one or both
servers, the concerning server should change to local clock or rather use
the peering server mate via local network to synchronize to his local clock.

But in all cases the servers should synchronize to the same time source.

For this i appened the hardware clock as fallback time source with two
different strata (server1 has a fudged stratum of 5, server2 has a fudged
straum of 10).

My expected behavior is, that server1 will be mastering server2 if both
servers doesn't have an network connection to the external time servers.
Instead they are synchronizing both to their own local clocks.

Whats my lack of understanding?
How can i correct my configuration?

I append the configuration of both servers and the output of ntpq -p.

Hope you can help me out of this ... :-)

By all means, have some nice christmas days!
Yours Mike

======================================================================================

===================
### On Server 1
===================
server1:/ # ntpq -p

     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 extern1         .INIT.          16 u    -   64    0    0.000    0.000
0.000
 extern2         .INIT.          16 u    -   64    0    0.000    0.000
0.000
*LOCAL(0)        .LOCL.           5 l   42   64  377    0.000    0.000
0.001
 server2         LOCAL(0)        11 u   15   64  377    0.160   98.151
0.057

------------------------------------------------------------------------------

server1:/ # cat /etc/ntp.conf

server extern1 maxpoll 6
server extern2 maxpoll 6
peer server2 maxpoll 6
server 127.127.1.0 maxpoll 6
fudge 127.127.1.0 stratum 5

driftfile /var/lib/ntp/drift/ntp.drift

logfile   /var/log/ntp


##############################################################################


===================
### On Server 2
===================
server2:/ # ntpq -p

     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 extern1         .INIT.          16 u    -   64    0    0.000    0.000
0.000
 extern2         .INIT.          16 u    -   64    0    0.000    0.000
0.000
*LOCAL(0)        .LOCL.          10 l   33   64  377    0.000    0.000
0.001
 server1         LOCAL(0)         6 u    4   64  377    0.144  -98.136
0.066

------------------------------------------------------------------------------

server2:/ # cat /etc/ntp.conf

server extern1 maxpoll 6
server extern2 maxpoll 6
peer server1 maxpoll 6
server 127.127.1.0 maxpoll 6
fudge 127.127.1.0 stratum 10

driftfile /var/lib/ntp/drift/ntp.drift

logfile   /var/log/ntp



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