lhommedumatch wrote:
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
Read the documentation CAREFULLY! I think that you will find that "offset" is NOT the difference between your clock and the correct time!
There IS a number that does represent the difference between your clock and the correct time but I have forgotten what it's called.
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