Re: Re: Tracking Clock Skew; Computer Forensics

My understanding is that ntpd, as opposed to ntpdate, is supposed to
synchronize continuously.. for some definition of "continuously" :)

On Wed, Mar 09, 2005 at 10:42:15AM +0100, Adam Duck wrote:
> Matthew Toseland <toad-EI5O+8PHWbJeeLb3ft/[email protected]> writes:
> 
> >> I thought about that.  But wouldn't you still have a consistent,
> >> detectable skew, at least most of the time? 
> >
> > You think so? Caused by what?
> 
> If you don't synchronize often enough.  From page 10 of the paper in
> question:
> 
> ---
> "As the horizontal line in Table 3 indicates, we divide our
> experiments into two sets. In the first set, our experiments last for
> three hours and exchange one TCP packet every minute (we do this by
> performing a sleep(60) on host1). For the second set of experiments,
> the connections last for 30 minutes, and a packet is exchanged at
> random intervals between 0 and 2 seconds, as determined by a usleep on
> host1. With few exceptions, the packets from laptop are all ACKs with
> no data."
> ---
> 
> The clock skew estimates are roughly the same.  And I always found
> that synching one time a day would be enough, well...
> 
> bye, Adam.
> 
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-- 
Matthew J Toseland - toad-EI5O+8PHWbJeeLb3ft/[email protected]
Freenet Project Official Codemonkey - http://freenetproject.org/
ICTHUS - Nothing is impossible. Our Boss says so.

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