Re: [NTP issue] how long does it take to ntp synchronization?
I'm testing about ntp synch time with below topology
RT1 ------------ RT2 ------------- RT3
RT1 : ntp client
RT2 : ntp master
RT3 : ntp client
ntp server 18.104.22.168(RT2 ip address)
ntp server 22.214.171.124
when i change the clock on RT2,
RT1 and RT2 clock will change.
but the time of clock change is different between RT1 and RT3.
RT1's clock was changed 6 mininutes later after clock change of the RT2(ntp master)
but RT3's clock was changed 8 minitues later after clock change of the RT2.
why above synch time difference does occur?
is there anyone knows about this?
Time sync in ntp client and server generally used to excahage several packet where each exchange is a pair of request and reply. When sending out a request, the client stores its own time (originate timestamp) into the packet being sent. When a server receives such a packet, it will in turn store its own time (receive timestamp) into the packet, and the packet will be returned after putting a transmit timestamp into the packet. When receiving the reply, the receiver will once more log its own receipt time to estimate the travelling time of the packet. The travelling time (delay) is estimated to be half of "the total delay minus remote processing time", assuming symmetrical delays.
Those time differences can be used to estimate the time offset between both machines, as well as the dispersion (maximum offset error). The shorter and more symmetric the round-trip time, the more accurate the estimate of the current time.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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