Look at carefully Steve Kostecke's message where he said:
step == reset the clock to the correct time in _one_ instantaneous step.
A stepped clock can "move backwards".
slew == adjust the clock by speeding it up or slowing it down. A slewed
clock never "moves backw
ns@lists.ntp.isc.org
Sent: Monday, April 30, 2007 9:02 PM
Subject: Re: [ntp:questions] stepping and slewing
Riccardo Castellani wrote:
> but can I define slew rate and step rate ?
> Pheraps these parameters are defined inside kernel of o.s. ?
> slew rate is always 0.5 ms/sec
: questions@lists.ntp.isc.org
Sent: Sunday, April 29, 2007 11:25 PM
Subject: Re: [ntp:questions] stepping and slewing
Riccardo Castellani wrote:
> What is difference among stepping and slewing mode which are used by ntpd ?
> ___
> question
, 2007 11:25 PM
Subject: Re: [ntp:questions] stepping and slewing
Riccardo Castellani wrote:
> What is difference among stepping and slewing mode which are used by ntpd ?
> ___
> questions mailing list
> questions@lists.ntp.isc.o
What is difference among stepping and slewing mode which are used by ntpd ?
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I'm interesting to align time in my four DB servers (HP-UX o.s.) of my company.
But I'm not just sure to use ntpd -qg or ntpd as service.
my doubts:
-
if I use "ntpd -qg":
1 - if server time is backward real time, does "ntpd -qg" slew time immediately
?
2 - if server time is forward real time
Why should I have to use iburst option in server command to speed up ?
when is the "iburst" option necessary ?
- Original Message -
From: Steve Kostecke
Newsgroups: comp.protocols.time.ntp
To: questions@lists.ntp.isc.org
Sent: Monday, April 16, 2007 1:33 PM
Subject: Re: [ntp:
protocols.time.ntp
To: [EMAIL PROTECTED]
Sent: Saturday, April 14, 2007 10:00 PM
Subject: Re: [ntp:questions] Linux client ntp
>>> In article <[EMAIL PROTECTED]>,
[EMAIL PROTECTED] (Riccardo Castellani) writes:
Riccardo> 1. I thought with "restrict default ignore" set
teful inspection firewall.
thanks
Riccardo
- Original Message -
From: Richard B. gilbert
Newsgroups: comp.protocols.time.ntp
To: [EMAIL PROTECTED]
Sent: Friday, April 13, 2007 3:59 PM
Subject: Re: [ntp:questions] Linux client ntp
Steve Kostecke wrote:
> On 2007-04-13, RICCARDO <[E
wsgroups: comp.protocols.time.ntp
To: [EMAIL PROTECTED]
Sent: Friday, April 13, 2007 3:59 PM
Subject: Re: [ntp:questions] Linux client ntp
Steve Kostecke wrote:
> On 2007-04-13, RICCARDO <[EMAIL PROTECTED]> wrote:
>
>
>>I want to use ntpd -qg, it could
I want to use ntpd -qg, it could be right this ntp.conf for my Linux
client ?
restrict default ignore
restrict 127.0.0.1
restrict server A
restrict server B
server A
server B
driftfile /var/lib/ntp/drift
broadcastdelay 0.008
Can i delete "broadcastdelay" and restrict 127.0.0.1 ?
___
ecated but I'm interesting to know if they work
> > in the same way, is ntpdate behavior different in comparison to ntpd ?
>
> > Messaggio originale
> > Da: [EMAIL PROTECTED]
> > Data: 11/04/2007 1.43
> > A: <[EMAIL PROTECTED]>
> > Ogg: Re: [ntp:ques
than
> repeated use of ntpdate.
>
> -Tom
>
> [EMAIL PROTECTED] wrote:
> > I know ntpdate is deprecated but I'm interesting to know if they work
> > in the same way, is ntpdate behavior different in comparison to ntpd ?
> >
> > Messaggio originale---
I'm interesting to know if they work
> > in the same way, is ntpdate behavior different in comparison to ntpd ?
>
> > Messaggio originale
> > Da: [EMAIL PROTECTED]
> > Data: 11/04/2007 1.43
> > A: <[EMAIL PROTECTED]>
> > Ogg: Re: [ntp:ques
If I use ntpd -gq in my client I should adjust time to little steps
using adjtime system call, but what's difference with "ntpdate -B" ?
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I'm using ntpdate (with -B option) at cron interval to retrieve time
from my client; someone says ntpdate is deprecated but I think time
offset is usually very little at every each cron interval and with
"adjtime" system call it's more soft to adjust time. (it slowly steers
pc clock)
Only at boot t
on of NTP does. It's called NTPD.
I'd give
that a try.
- Eric
On 28 Mar 2007 02:50:11 -0700, "RICCARDO" <[EMAIL PROTECTED]> wrote for
the entire planet to see:
>I use ntpdate command in crond to synchronize local clock of my Linux
>servers.
>I ru
, then slowly steer the PC clock to match it.
> No
> steps, no dependency on a particular server.
>
> This is what the reference implementation of NTP does. It's called NTPD.
> I'd give
> that a try.
>
> - Eric
>
> On 28 Mar 2007 02:50:11 -0700, "R
, then slowly steer the PC clock to match it.
> No
> steps, no dependency on a particular server.
>
> This is what the reference implementation of NTP does. It's called NTPD.
> I'd give
> that a try.
>
> - Eric
>
> On 28 Mar 2007 02:50:11 -0700, "R
I use ntpdate command in crond to synchronize local clock of my Linux
servers.
I run ntpdate -B -s ntp1.ien.it ntp2.ien.it
1- NTP algorithm will choose best time, so is't possible client
retrieves time from ntp1 server or ntp2 ? Can you confirm me this
behaviour ?
2- Does it exist way to retrieve
Do you know if exist NTP servers (with authentication) which are free ?
Is't usually necessary to pay for having authentication support from ntp
servers ?
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If my external time sources are unavailable and I don't set
Undisciplined Local Clock in ntp server, clients can synchronize
themselves to my server ?
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What do you think of my ntp.conf ?
These istructions are contained in my ntp.conf of my server:
logfile /var/log/ntp.log
restrict default ignore
restrict 127.0.0.1
restrict server-A mask 255.255.255.255 nomodify
restrict server-B mask 255.255.255.255 nomodify
# A,B : my internal time server
res
Do you enable authentication level on NTP server ?
I have one NTP server (A) which is on both internal and external network, and
another 2 NTP server (B, C) in internal netowrk.
A is used to retrieve time information from Internet while B,C retrieve time
from A and distributing it to clients.
Whe
My system is always run (server Master, server A , server B).
I think ntpd polling time was 64s as default but you'are telling me
that ntpd uses variable polling time according to environment and
system status ?
Hal Murray ha scritto:
> In article <[EMAIL PROTECTED]>,
> &
I'm going to set Minpoll and Maxpoll time in my ntpd.conf for my NTP
internal server (MASTER) which must be synchronized to external
servers (stratum 1 or 2), because I think 64s is too low so i want to
increase it.
I have another 2 internal time servers (A, B) which must be
synchronized to my MAST
I tried to add into my ntp.conf this line:
restrict ntp1.inrim.it nomodify noquery notrap nopeer
likes to work !
I found into this group that "restrict" requires only ipaddress but
also with hostname I had no problems. I'm using fedora Core 4 and I
installed ntp-4.2.0.a.20050816-0.FC4
__
<>
What do you suggest me, to use server hostnames which resolve unique
IP address ?
How many servers should you insert into ntp.conf ? min. 4 ?
Steve Kostecke ha scritto:
> On 2007-03-13, RICCARDO <[EMAIL PROTECTED]> wrote:
>
> > I'm going to create my inte
On 14 Mar, 03:38, Steve Kostecke <[EMAIL PROTECTED]> wrote:
> On 2007-03-13, RICCARDO <[EMAIL PROTECTED]> wrote:
>
> > If set "restrict X.Y.K.Z notrap" which operations are not permitted to
> > my time server from X.Y.K.Z machine ?
>
> notrap ==>
I'm going to create my internal time server, what do you think it I
set ntp.conf so:
restrict default ignore
restrict 127.0.0.1
restrict 1.europe.pool.ntp.org mask 255.255.255.255 nomodify noquery
notrap
#for stratum 1 time server
restrict 196.200.3.0 mask 255.255.255.0 nomodify noquery notrap
#f
If set "restrict X.Y.K.Z notrap" which operations are not permitted to
my time server from X.Y.K.Z machine ? It's equivalent to not use ntpq
utility ?
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e hour.
If in my local settings I had set for example Japan (Japan doesn't use
Daylight Saving time) I would have no time changing ?!
- Original Message -
From: Dmitry Ivanov
To: RICCARDO
Cc: questions@lists.ntp.isc.org
Sent: Thursday, March 08, 2007 10:35 AM
Subject: Re: [ntp:ques
Do two peer servers negotiate time ? or They share time ?.
I think configuring in my lan "ntp service" in two servers (Master1 ,
Master2) which are opened to public network.
Master1:
server ntp1.ien.it
server ntp2.ien.it
server ntp.iriti.cnr.it
server tempo.cstv.to.cnr.it
peer Master2
Master2:
When it will start Daylight Saving time, is there automatic time
traslation indipendent from what ntp server I configured in my
ntp.conf ?
Server must be italian or European ?
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I have 15 clients in my lan, it's correct to insert as first entry in
ntp configuration the same server on all 15 clients ?
case 1:
client K1,K2,K3,...K15 :
server time.ien.it
server ntp2.ien.it
server ntp1.ien.it
case 2:
client K1
server time.ien.it
server ntp2.ien.it
server ntp1.ien.it
client
On 4 Mar, 11:54, Jan Ceuleers <[EMAIL PROTECTED]> wrote:
> Riccardo,
>
> Riccardo wrote:
> > What's logic to select the server (among these 3 peers) which gives reliable
> > time to two others ?
>
> In your example, each of the TI-x servers in fact has t
On 4 Mar, 16:18, "Richard B. gilbert" <[EMAIL PROTECTED]> wrote:
> Riccardo wrote:
> > Ok, How is't possible that these three peer servers share time information
> > among themselves ?
>
> > For example:
> > Server "A" shall retrieve ti
Ok, How is't possible that these three peer servers share time information
among themselves ?
For example:
Server "A" shall retrieve time information (for example "TI-1") from public
server of stratum 1 (ntp1.ien.it),
Server "B" shall retrieve time information (for example "TI-2") from public
serv
If I have 3 time servers (at same stratum) in my lan where each server
is indipendent and has set several NTP servers of stratum 1; I 'd like
creating redundancy so I think to insert peer option (using symmetric
mode) in ntp.conf for all 3 servers.
A
peer B
peer C
B
peer A
peer C
C
peer A
peer B
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