10-02-2003
That behavior is normal. Or perhaps even abnormally good. xntp predicts the arrival of a packet from its peer. If that prediction is off by 128 milliseconds or more it gets mad and resyncs. When your peer is across the internet, that is guaranteed to happen several times a day. At least, that's what I thought....you must have an awesome isp or something.
I believe error messages until I have a sound reason to doubt them. If your peer is too far away, then your peer is too far away. The closer you are to your peer, the better. And best of all is to have your peer on the same lan.
Your dispersion is 10.01 which I think is great. I wouldn't worry until it gets close to 1000. At 1000 your system clock could be a full second off....I won't tolerate that. But people who sit around tuning ntp until the dispersion drops below one are crazy unless they work in astronomy or something.
Your setup could be improved quite a bit if you want to. You should have a ntp server outside of any firewalls and it should have 6 or 7 peers, not just one. Then your internal boxes should sync up with it.
And the
Ultimate Solution.....
HP sold off all of its cool non-computer stuff
I don't remember the name of the spin-off company. But they sell HP's old atomic clock. If you get that with the high performance cesium beam tube you will have a clock so accurate that no computer in existence can sync to it. It has a serial port and you can plug it in to your system and configure ntp to use it. That's the most accuracte clock available for sale as a product. Just a suggestion
10 More Discussions You Might Find Interesting
1. Solaris
Dear All
I'm solaris user . I need to setup NTP authentication for my office server but I have some question for ntp setting up. I need to know if i set authen NTP the client that doesn't set for authen key can sync time from authen ntp server or not ?? when i setup the authen at ntp server ... (1 Reply)
Discussion started by: goasutlor
1 Replies
2. UNIX for Dummies Questions & Answers
All -
i tried to sysn the clock from our server to get the timing and the server IP has been added in the ntp.conf file and i have some problems here. if some1 help me to solve this problem.
1. i can ping server
2. i was unable to ntpq -p (time out, no response from remote server, it looks... (2 Replies)
Discussion started by: March_2007
2 Replies
3. AIX
Hello everybody! When I run command "ntpdate" the following error occures
"ksh: ntpdate: 0403-006 Execute permission denied.
"
# oslevel -s
5300-08-06-0918
oslevel -r
5300-08
eny suggestion friends? :-) (3 Replies)
Discussion started by: wwwzviadi
3 Replies
4. Red Hat
Hi,
I have 4 machines and all are NTP configured with same ntp.conf file. But 3 machines are in sync with Time server and 4th machine is not contacting & sync with the NTP server. Please see the below details.
# service ntpd stop
Stopping ntpd: ... (0 Replies)
Discussion started by: uday123
0 Replies
5. Solaris
Hi,
I have edited the /etc/inet/ntp.conf file to point to a new time server. When I restart ntp on Solaris 10 using 'svcadm disable/enable ntp' it still points to the old ntp server when I run a 'ntpq -p'.
Any ideas?
Thanks.
Sparcman (4 Replies)
Discussion started by: sparcman
4 Replies
6. UNIX for Advanced & Expert Users
Hello every one i want to setup a ntp on sco unix 5.0.6 and i don't have any time server how can i do this with local time (1 Reply)
Discussion started by: kaydream
1 Replies
7. Emergency UNIX and Linux Support
Hi,
I'm having problem with my DNS and NTP.
For the DNS:
I'm using RHEL4, Bonding and heartbeat.
Bond0 IP address: 192.168.1.10
Heartbeat or Bond0:0: 192.168.1.50
Currently, I use my heartbeat ip address for my DNS or in named.conf
Everytime I reboot my server, it says that dns/named... (3 Replies)
Discussion started by: flekzout
3 Replies
8. AIX
I got an ntp time problem on AIX server.
os version is AIX7.1
OS LEVEL 7.1.0.0
i got below output,when i run the below command
bash-3.2# ntpdate -dv XXXXXXXXXXXXXXXXXXXXXXXX
4 Dec 12:50:49 ntpdate: 3.4y
transmit(xxxxxxxxx)
receive(xxxxxxxxx)
transmit(xxxxxxxx)
receive(xxxxxxxxx)... (9 Replies)
Discussion started by: murali969
9 Replies
9. Red Hat
Hi,
I have two ntp servers in my cluster and I want all the nodes in my cluster to sync with either of the ntp servers or just one. Unfortunately it keep rotating the sync, between my ntp server 1, ntp server 2 and local. Is there anyway I can change the sync to avoid local?
# ntpq -p
... (3 Replies)
Discussion started by: pjeedu2247
3 Replies
10. UNIX for Beginners Questions & Answers
Someone, please help on this issue:-
Note : for security reason i didn't mention hostnames and ips.
==============================================================================
# ntpstat
unsynchronised
polling server every 1024 s
Ntpstat showing unsynchronised.
... (29 Replies)
Discussion started by: shanmugaraj
29 Replies
LEARN ABOUT ULTRIX
ntp.conf
ntp.conf(5) File Formats Manual ntp.conf(5)
Name
ntp.conf - Network Time Protocol configuration file
Description
The file is the configuration file for the Network Time Protocol (NTP) daemon, This file must be configured on your system before running
Any host names that you specify in the file must have an entry in the file, or an entry in the master database, if the database is being
served to your system by BIND/Hesiod or Yellow Pages.
The file has four entry formats:
trusting no
This entry guarantees that your system synchronizes only to the NTP servers identified in the peer and server entries specified. Dig-
ital recommends that all systems include the entry.
peer server
This entry identifies server as one of the NTP servers that your system trusts, and from which your system will accept time synchro-
nization. Your system may also provide time synchronization to this server. Servers can be identified by host name or internet
address.
NTP servers should be configured with entries.
server server
This entry identifies server as one of the NTP servers that your system trusts, and from which your system will accept time synchro-
nization. Your system can not provide time synchronization to this server. Servers can be identified by host name or internet
address.
NTP clients should be configured with entries.
peer /dev/null LOCL 1 -5 local
This entry identifies your system as a local reference clock. A local reference clock is the most accurate system clock available at
your site. If you receive time synchronization from the Internet NTP service, you should not include this entry on any of your sys-
tems. At most, one system in a set of nodes running should be identified as a local reference clock.
A host which specifies this entry should not specify any or entries.
Examples
This is a sample configuration file for an NTP client which receives time synchronization from the NTP servers: and Lines beginning with a
number sign (#) are comments.
#
# NTP Configuration File
# This file is mandatory for the ntpd daemon
#
#
#
# ** A L L **
#
# "trusting no" prevents this host from synchronizing
# to any host that is not listed below. It is recommended
# that all hosts include the line "trusting no".
#
trusting no
#
#
# ** S E R V E R **
#
# If you are configuring a server, use "peer" entries to
# synchronize to other NTP servers. For example, server1,
# server2, and server3.
#
#peer server1
#peer server2
#peer server3
#
#
#
#
# ** C L I E N T **
#
# If you are configuring a client, use "server" entries to
# synchronize to NTP servers. For example, server1, server2,
# and server3.
#
server server1
server server2
server server3
#
#
#
# ** L O C A L R E F E R E N C E C L O C K **
#
# If you are configuring a local reference clock, include the
# following entry and the "trusting no" entry ONLY.
#
#peer /dev/null LOCL 1 -5 local
#
See Also
ntp(1), ntpd(8), ntpdc(8)
RFC 1129--Internet time synchronization: The Network Time Protocol
Introduction to Networking and Distributed System Services
ntp.conf(5)