[ntp:hackers] NTP and Windows Vista & Windows-7 - server timestamps
David J Taylor
david-taylor at blueyonder.co.uk
Fri Dec 11 14:54:12 UTC 2009
From: "Brian Utterback" <>
[]
> Does Vista/W7 support something like SO_TIMESTAMP? That could cause
> different types of clocks to be used, I suppose. Otherwise I would
> think that the same calls would be used at rec and tran times.
I don't know, Brian. Dave Hart is close to the Windows NTP code and you
know how the time was derived. I find C very difficult to read.
> Another possibility would be if the clock was stepped while the packet
> is being processed. Could a clock step be delayed somehow on V/W7?
I'm not clear how that could cause the server-RX time to be greater than
the server-TX time.
> I would suggest trying to capture the packets using something like
> wireshark to eliminate any possibility of a bug in the test program.
I'm not into wireshark, either. I can make the program available to
anyone who wants to try it. I'm moderately confident in the test program
as Windows-2000 and Windows-XP servers behave just as expected.
Cheers,
David
--
SatSignal software - quality software written to your requirements
Web: www.satsignal.eu
Email: davidtaylor at writeme.com
More information about the hackers
mailing list