[ntp:questions] how to have offset < 1ms
lhommedumatch
ludocluba at yahoo.com
Mon Apr 12 20:04:59 UTC 2010
I have my PC clock synchronised with a ntp server (ntpgmtaceb).
With ntpq -p, I see an offset of 6ms.
How can I be sure to have an offset < 1ms
ntpq -p
remote refid st t when poll reach delay
offset jitter
==============================================================================
LOCAL(0) .LOCL. 10 l 61 64 377 0.000
0.000 0.001
*ntpgmtaceb .1PPS. 1 u 709 1024 377 29.431
-6.450 0.917
Here is my ntp.conf:
# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
restrict default kod nomodify notrap nopeer noquery
# Permit all access over the loopback interface. This could
# be tightened as well, but to do so would effect some of
# the administrative functions.
restrict 127.0.0.1
restrict -6 ::1
# Hosts on local network are less restricted.
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/
join.html).
#broadcast 192.168.1.255 key 42 # broadcast server
#broadcastclient # broadcast client
#broadcast 224.0.1.1 key 42 # multicast server
#multicastclient 224.0.1.1 # multicast client
#manycastserver 239.255.254.254 # manycast server
#manycastclient 239.255.254.254 key 42 # manycast client
# Undisciplined Local Clock. This is a fake driver intended for backup
# and when no outside source of synchronized time is available.
server 127.127.1.0
fudge 127.127.1.0 stratum 10
# Drift file. Put this in a directory which the daemon can write to.
# No symbolic links allowed, either, since the daemon updates the file
# by creating a temporary in the same directory and then rename()'ing
# it to the file.
driftfile /var/lib/ntp/drift
# Key file containing the keys and key identifiers used when operating
# with symmetric key cryptography.
keys /etc/ntp/keys
# Specify the key identifiers which are trusted.
#trustedkey 4 8 42
# Specify the key identifier to use with the ntpdc utility.
#requestkey 8
# Specify the key identifier to use with the ntpq utility.
#controlkey 8
server ntpgmtaceb
restrict ntpgmtaceb mask 255.255.255.255 nomodify notrap noquery
Regards,
Ludovic
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