RE: NTP From an IOS Box to a Windows box

From: Church, Charles (cchurch@multimax.com)
Date: Tue Jun 05 2007 - 14:48:58 ART


Yes, I've done it before. A very important thing to remember is that
Windows uses SNTP rather than NTP. It doesn't have the sanity checking
built in to not accept time from a source that isn't itself
synchronized. So if your IOS box doesn't have a hardware calendar (7200
and up for the most part, I think) and you reboot the router, it'll come
up with a 1993 time/date. That may reek havoc on a server that
timestamps everything if it asks for time before the router itself has
synced. I used a time-based ACL on interfaces that only allows inbound
NTP is the date is later than year 2006. So only when the router gets
it's time right will it accept inbound requests.

Chuck Church
Multimax Principal Network Engineer, CCIE #8776
EDS Contractor, Multimax - Navy Marine Corps Intranet (NMCI)
1210 N. Parker Rd. | Greenville, SC 29609
Office: 864-335-9473 | Cell: 864-266-3978
cchurch@multimax.com

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Sadiq Yakasai
Sent: Tuesday, June 05, 2007 10:22 AM
To: ccielab
Subject: NTP From an IOS Box to a Windows box

hey Guys,

so can i have a Windows machine (DC) have ntp synchronized to a Cisco
IOS Box (Cat 3750)?

There was a similar thread a while ago but the requirement was to have
an IOS box sync to a Windows box....

Thanks

Sadiq



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