questions about time-sync using NTP and w32tm

[Heinz]

Hello,

I have some questions about NTP and time-sync.

I have the following environment :

Win2003 AD
one DC (PDC Emulator\PDCe) does sync with a NTP server in the internet
second Domaincontroller (DC2)
XP Clients
W2K Clients
Memberservers

Now I wonder what machines in the LAN are NTP servers, what machines are a
NTP clients and what protocols are used to sync time in the LAN between
XP\W2K workstations, DCs, memberservers and the PDCe

My questions are :

1. The XP\W2K workstations :
Where do they get their time from? I think from the authenticating DC?
Are the workstations NTP clients ? If they are : then all DCs are NTP
servers? (see 3.)

On a XP client I start:

w32tm /monitor

DC2[10.1.0.68]:
ICMP: 0ms delay.
NTP: -0.0312770s offset from PDCe
RefID: PDCe [10.1.0.49]
PDCe *** PDC *** [10.1.0.49]:
ICMP: 0ms delay.
NTP: +0.0000000s offset from PDCe
RefID: ptbtime1.ptb.de [192.53.103.108]


What does this output mean?
That DC2 and PDCe are both NTP Servers ? (see 3.)
That this XP machine is a NTP Client and uses NTP to connect to PDCe *and*
to DC2 ?
Where does this XP client get its time from?

HKLM\SYSTEM\CurrentControlSet\Services\W32Time\Parameters is "NT5DS"
Since this value is "NT5DS" - and not "NTP" - I think the XP machine is not
a NTP client ?


2. Is the PDCe both: a NTP server and a NTP client ?
Since the PDCe connects to a NTP-Server on the internet I think the PDCe is
a NTP client.
But is the PDCe a NTP Server, too?
Who gets its time from the PDCe ? The other DCs ?
if so:
-how often do the other DCs sync their time with the PDCe?
-Using NTP?


3. Is DC2 a NTP server?
Are all domaincontrollers NTP servers?

HKLM\SYSTEM\CurrentControlSet\Services\W32Time\Parameters is "NTP"
Since this value is "NTP" - I think DC2 is NTP server ?
Or is DC2 (only) a NTP-client connecting to the PDCe ?

DC2 will sync its time with all XP\W2K workstations that authenticate
against it?
Using which protokoll ? NTP ?


4. Poll intervall:
I have read that XP clients will sync their time automatically with the DC
that has authenticated them - but how often will this happen?

So how can I find out how often the XP\W2K workstations and the
DCs\Memberservers are contacing their timeserver?
Does this happen automatically?


thank you

Heinz

 

[Dave Patrick]

These articles may help.

http://technet.microsoft.com/en-us/library...013(WS.10).aspx
http://support.microsoft.com/kb/224799
http://technet.microsoft.com/en-us/library...263(WS.10).aspx



--

Regards,

Dave Patrick ....Please no email replies - reply in newsgroup.
Microsoft Certified Professional
Microsoft MVP [Windows]
http://www.microsoft.com/protect


"Heinz" wrote:
> Hello,
>
> I have some questions about NTP and time-sync.
>
> I have the following environment :
>
> Win2003 AD
> one DC (PDC EmulatorPDCe) does sync with a NTP server in the internet
> second Domaincontroller (DC2)
> XP Clients
> W2K Clients
> Memberservers
>
> Now I wonder what machines in the LAN are NTP servers, what machines are a
> NTP clients and what protocols are used to sync time in the LAN between
> XPW2K workstations, DCs, memberservers and the PDCe
>
> My questions are :
>
> 1. The XPW2K workstations :
> Where do they get their time from? I think from the authenticating DC?
> Are the workstations NTP clients ? If they are : then all DCs are NTP
> servers? (see 3.)
>
> On a XP client I start:
>
> w32tm /monitor
>
> DC2[10.1.0.68]:
> ICMP: 0ms delay.
> NTP: -0.0312770s offset from PDCe
> RefID: PDCe [10.1.0.49]
> PDCe *** PDC *** [10.1.0.49]:
> ICMP: 0ms delay.
> NTP: +0.0000000s offset from PDCe
> RefID: ptbtime1.ptb.de [192.53.103.108]
>
>
> What does this output mean?
> That DC2 and PDCe are both NTP Servers ? (see 3.)
> That this XP machine is a NTP Client and uses NTP to connect to PDCe *and*
> to DC2 ?
> Where does this XP client get its time from?
>
> HKLMSYSTEMCurrentControlSetServicesW32TimeParameters is
> "NT5DS"
> Since this value is "NT5DS" - and not "NTP" - I think the XP machine is
> not a NTP client ?
>
>
> 2. Is the PDCe both: a NTP server and a NTP client ?
> Since the PDCe connects to a NTP-Server on the internet I think the PDCe
> is a NTP client.
> But is the PDCe a NTP Server, too?
> Who gets its time from the PDCe ? The other DCs ?
> if so:
> -how often do the other DCs sync their time with the PDCe?
> -Using NTP?
>
>
> 3. Is DC2 a NTP server?
> Are all domaincontrollers NTP servers?
>
> HKLMSYSTEMCurrentControlSetServicesW32TimeParameters is "NTP"
> Since this value is "NTP" - I think DC2 is NTP server ?
> Or is DC2 (only) a NTP-client connecting to the PDCe ?
>
> DC2 will sync its time with all XPW2K workstations that authenticate
> against it?
> Using which protokoll ? NTP ?
>
>
> 4. Poll intervall:
> I have read that XP clients will sync their time automatically with the DC
> that has authenticated them - but how often will this happen?
>
> So how can I find out how often the XPW2K workstations and the
> DCsMemberservers are contacing their timeserver?
> Does this happen automatically?
>
>
> thank you
>
> Heinz
>
>

 

[DaveMills]

This article will get you started. There is a much more detail article at MS but
I can't find it right now.
http://www.windowsnetworking.com/articles_...me-Service.html

On Mon, 21 Sep 2009 21:25:38 +0200, "Heinz"
wrote:

>Hello,
>
>I have some questions about NTP and time-sync.
>
>I have the following environment :
>
>Win2003 AD
>one DC (PDC EmulatorPDCe) does sync with a NTP server in the internet
>second Domaincontroller (DC2)
>XP Clients
>W2K Clients
>Memberservers
>
>Now I wonder what machines in the LAN are NTP servers, what machines are a
>NTP clients and what protocols are used to sync time in the LAN between
>XPW2K workstations, DCs, memberservers and the PDCe
>
>My questions are :
>
>1. The XPW2K workstations :
>Where do they get their time from? I think from the authenticating DC?
>Are the workstations NTP clients ? If they are : then all DCs are NTP
>servers? (see 3.)
>
>On a XP client I start:
>
>w32tm /monitor
>
>DC2[10.1.0.68]:
> ICMP: 0ms delay.
> NTP: -0.0312770s offset from PDCe
> RefID: PDCe [10.1.0.49]
>PDCe *** PDC *** [10.1.0.49]:
> ICMP: 0ms delay.
> NTP: +0.0000000s offset from PDCe
> RefID: ptbtime1.ptb.de [192.53.103.108]
>
>
>What does this output mean?
>That DC2 and PDCe are both NTP Servers ? (see 3.)
>That this XP machine is a NTP Client and uses NTP to connect to PDCe *and*
>to DC2 ?
>Where does this XP client get its time from?
>
>HKLMSYSTEMCurrentControlSetServicesW32TimeParameters is "NT5DS"
>Since this value is "NT5DS" - and not "NTP" - I think the XP machine is not
>a NTP client ?
>
>
>2. Is the PDCe both: a NTP server and a NTP client ?
>Since the PDCe connects to a NTP-Server on the internet I think the PDCe is
>a NTP client.
>But is the PDCe a NTP Server, too?
>Who gets its time from the PDCe ? The other DCs ?
>if so:
>-how often do the other DCs sync their time with the PDCe?
>-Using NTP?
>
>
>3. Is DC2 a NTP server?
>Are all domaincontrollers NTP servers?
>
>HKLMSYSTEMCurrentControlSetServicesW32TimeParameters is "NTP"
>Since this value is "NTP" - I think DC2 is NTP server ?
>Or is DC2 (only) a NTP-client connecting to the PDCe ?
>
>DC2 will sync its time with all XPW2K workstations that authenticate
>against it?
>Using which protokoll ? NTP ?
>
>
>4. Poll intervall:
>I have read that XP clients will sync their time automatically with the DC
>that has authenticated them - but how often will this happen?
>
>So how can I find out how often the XPW2K workstations and the
>DCsMemberservers are contacing their timeserver?
>Does this happen automatically?
>
>
>thank you
>
>Heinz
>
--
Dave Mills
There are 10 types of people, those that understand binary and those that don't.

 

[Ace Fekay [MCT]]

"Heinz" wrote in message
news:u0gkaDvOKHA.508@TK2MSFTNGP06.phx.gbl...
> Hello,
>
> I have some questions about NTP and time-sync.
>
> I have the following environment :
>
> Win2003 AD
> one DC (PDC EmulatorPDCe) does sync with a NTP server in the internet
> second Domaincontroller (DC2)
> XP Clients
> W2K Clients
> Memberservers
>
> Now I wonder what machines in the LAN are NTP servers, what machines are a
> NTP clients and what protocols are used to sync time in the LAN between
> XPW2K workstations, DCs, memberservers and the PDCe
>
> My questions are :
>
> 1. The XPW2K workstations :
> Where do they get their time from? I think from the authenticating DC?
> Are the workstations NTP clients ? If they are : then all DCs are NTP
> servers? (see 3.)
>
> On a XP client I start:
>
> w32tm /monitor
>
> DC2[10.1.0.68]:
> ICMP: 0ms delay.
> NTP: -0.0312770s offset from PDCe
> RefID: PDCe [10.1.0.49]
> PDCe *** PDC *** [10.1.0.49]:
> ICMP: 0ms delay.
> NTP: +0.0000000s offset from PDCe
> RefID: ptbtime1.ptb.de [192.53.103.108]
>
>
> What does this output mean?
> That DC2 and PDCe are both NTP Servers ? (see 3.)
> That this XP machine is a NTP Client and uses NTP to connect to PDCe *and*
> to DC2 ?
> Where does this XP client get its time from?
>
> HKLMSYSTEMCurrentControlSetServicesW32TimeParameters is
> "NT5DS"
> Since this value is "NT5DS" - and not "NTP" - I think the XP machine is
> not a NTP client ?
>
>
> 2. Is the PDCe both: a NTP server and a NTP client ?
> Since the PDCe connects to a NTP-Server on the internet I think the PDCe
> is a NTP client.
> But is the PDCe a NTP Server, too?
> Who gets its time from the PDCe ? The other DCs ?
> if so:
> -how often do the other DCs sync their time with the PDCe?
> -Using NTP?
>
>
> 3. Is DC2 a NTP server?
> Are all domaincontrollers NTP servers?
>
> HKLMSYSTEMCurrentControlSetServicesW32TimeParameters is "NTP"
> Since this value is "NTP" - I think DC2 is NTP server ?
> Or is DC2 (only) a NTP-client connecting to the PDCe ?
>
> DC2 will sync its time with all XPW2K workstations that authenticate
> against it?
> Using which protokoll ? NTP ?
>
>
> 4. Poll intervall:
> I have read that XP clients will sync their time automatically with the DC
> that has authenticated them - but how often will this happen?
>
> So how can I find out how often the XPW2K workstations and the
> DCsMemberservers are contacing their timeserver?
> Does this happen automatically?
>
>
> thank you
>
> Heinz
>
>


Heinz,

In addition to Dave Patrick's and Dave Mill's great suggestions, see if my
article in the following link helps explain and answer your questions.

Configuring the Windows Time Service for Windows Server
http://msmvps.com/blogs/acefekay/archive/2...ows-server.aspx

--
Ace

This posting is provided "AS-IS" with no warranties or guarantees and
confers no rights.

Please reply back to the newsgroup or forum for collaboration benefit among
responding engineers, and to help others benefit from your resolution.

Ace Fekay, MCT, MCTS Exchange, MCSE, MCSA 2003 & 2000, MCSA Messaging
Microsoft Certified Trainer

For urgent issues, please contact Microsoft PSS directly. Please check
http://support.microsoft.com for regional support phone numbers.

 

[DaveMills]

On Mon, 21 Sep 2009 15:10:22 -0600, "Dave Patrick"
wrote:

>These articles may help.
>
>http://technet.microsoft.com/en-us/library...013(WS.10).aspx
>http://support.microsoft.com/kb/224799
>http://technet.microsoft.com/en-us/library...263(WS.10).aspx


Yes, that's them. Thanks and now bookmarked.
--
Dave Mills
There are 10 types of people, those that understand binary and those that don't.

 

[Ace Fekay [MCT]]

"Dave Patrick" wrote in message
news:OS4iw$vOKHA.4964@TK2MSFTNGP06.phx.gbl...
> These articles may help.
>
> http://technet.microsoft.com/en-us/library...013(WS.10).aspx
> http://support.microsoft.com/kb/224799
> http://technet.microsoft.com/en-us/library...263(WS.10).aspx
>
>

Good articles. I added them to my bookmarks and blog, too!

Thanks, Dave.

Ace