NTP stands for Network Time Protocol, and it is an Internet protocol used to synchronize the clocks of computers to some time reference.
Questions tagged [ntp]
718 questions
21
votes
4 answers
Is there research material on NTP accuracy available?
As far as I know, accuracy of NTP syncronization highly depends on the network. I've seen some numbers from 50 microseconds to a "below one second" over the internet. Well, this is a huge difference.
I believe, accuracy dependence is a great…
akalenuk
- 553
12
votes
2 answers
When should NTPd broadcast/broadcastclient be used instead of client/server or peer modes?
The NTP deamon if often used in its simplest mode, which is client/server: you specify one or more server directives in your ntp.conf and your clients will use those servers.
In addition to that, when you run your own NTP servers, it is good…
Luke404
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Will NTP drift the clock backwards
Will NTP move the system clock backwards? I'm thinking about creating unique ids which are partially based on the time. If the clock is moving backwards, I'd need to somehow account for that.
Dave
- 511
9
votes
2 answers
Proper NTP configuration for a few servers
I have about 20 Linux servers in a small network and I need their clocks decently close to each other (e.g. within 20msec). I've started with every one of them synced to europe.pool.ntp.org and the job is done.
Now I have two questions:
Am I a…
ndemou
- 1,365
9
votes
5 answers
Setting up a local stratum 2 NTP server
I'm trying to setup NTP on a local network that has no (and never will) internet connection. The main priority is that the machines on the network are synced with each other, even if the time they're synced at isn't 100% accurate.
We also have a…
fwg
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8
votes
2 answers
What is a realistic average time difference between servers in the same LAN?
Until recently, we had at work a small cluster of about 20 small Windows servers (which have now all been virtualized). They were all configured to synchronize with the local time server. It was on an 1Gb sub-network in our own DC. I never got them…
monster
- 618
8
votes
3 answers
Identify NTP clients using my server
I have an HPUX NTP Server. It is the server for a dumb client device that has NTP built-in. I can tell the client the server IP and interval but cannot get any logging out.
How do I know if NTP syncronization is taking place.
Ordinarily, I would…
Jonathan
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8
votes
3 answers
Looking for a NTP Server Software for Windows
I'm looking for a, preferably free, NTP Server for Windows Server 2003/2008. We have already tried the built in Windows Time Server, but our tests did show that it is not very accurate, we see time differences up to 500ms. The max time difference we…
Simon
7
votes
1 answer
Windows NTP Server A Stratum is 2, Windows NTP Server B Stratum is 15
We have a network that is mostly separated from our corporate network. The corporate network uses ntp1.corpaddress.tdl.
We have a second server, isolated.corpaddress.tdl. It is getting its NTP time from ntp1. We want it to act as the NTP server for…
user232246
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6
votes
1 answer
Why is NTP considering my server inadequate?
I have an embedded Linux device connected directly to my Windows desktop via a USB/Net interface. It's based on the Freescale iMX6 boards so I believe the clock hardware is the SNVS RTC.
On the desktop 192.0.0.10, I have W32Time running as an NTP…
user12022
5
votes
2 answers
Setting up NTP servers
I have a problem setting up NTP to maintain time on a stand-alone network. This will be an island time-zone. The problem is that the time drifts apart, even after they have been initially synchronised.
There are two redundant NTP servers running…
DanS
- 153
4
votes
2 answers
How to be sure that my system time is drifted?
in my some of production environment time is drifted, i install ntp on my system.
when i am executing ntpstat command, i can see below output.
synchronised to NTP server (169.254.169.123) at stratum 4
time correct to within 20 ms
polling…
4
votes
3 answers
winter and summer time switch without a break in the timeline
Does anybody know if there is a possibility to switch from summer- to wintertime without an interruption in the timeline.
I have an application that logs transactions with a timestamp.
The problem is, that I must not have overlapping timestamps. If…
user24143
4
votes
4 answers
Usefulness of a new stratum-1 NTP server
A physicist I know that works in a government institution recently commented that they have a cesium clock, and they were considering the possibility of setting up a public stratum 1 NTP server attached to it.
However they (and I) were wondering…
4
votes
1 answer
NTP devices - Meinberg etc
I am learning about NTP & I was wondering why anyone would buy a Separate Device like the time servers/devices available from Meinberg etc?
Can you not run some software which syncs with reputed time sources which would provide the same function?…
user93353
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