Server 2008 Time Sync

Hello all.  We want to set our PDC emulator to sync its time with an external source.  I found this link from the microsoft website for the procedure http://support.microsoft.com/kb/816042.  We would like to set our external time source to be our cisco router.  Can I add the ip address of the router as the time source, or does the time source service have to be a DNS name?  Thanks..
drzuraAsked:
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Scott AndersonPrincipal Support EngineerCommented:
You can add it as an IP address.

Ref:  http://technet.microsoft.com/en-us/library/cc773263(WS.10).aspx
under:  w32tm /config   parameters & description
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drzuraAuthor Commented:
So, if our router's ip address was 10.10.10.10, the following sequence of commands would correctly set our time source?

to set the external time source from the command line type:
w32tim /config /syncfromflags:manual /manualpeerlist:"10.10.10.10"

To make the PDC a reliable time source for the forest and clients:
w32tm /config /reliable:yes

To check the external time configuration:
w32tm /query /configuration


Thanks
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Darius GhassemCommented:
You can the monitor the system by w32tm /monitor

http://tigermatt.wordpress.com/2009/08/01/windows-time-for-active-directory/
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Scott AndersonPrincipal Support EngineerCommented:
Right on all counts... however, don't believe that the /reliable;yes switch is necessary.  All workstations in the domain will automatically do time sync with the PDC role holder.
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Lee OsborneCommented:
If you either use, or omit, the 0x1 flag from the w32tm command line, it determines whether you are specifying an IP or DNS time source.

For example:

w32tm /configure /manualpeerlist:dc.domain.com,0×1 /syncfromflags:manual /update
or
w32tm /configure /manualpeerlist:10.0.0.1 /syncfromflags:manual /update

I used this article to tidy my forest and time sync:

http://robsilver.org/ad/demystifying-time-in-a-forest/

Lee
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drzuraAuthor Commented:
Thanks all.  I appreciate the assistance
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