Ethereal-dev: Re: [Ethereal-dev] NetXray / Sniffer Time Codes [Fwd: NetXRay timing base]

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From: Jason House <jhouse@xxxxxxxxx>
Date: Wed, 14 Feb 2001 14:02:17 -0500
The capture was done with some version of Sniffer Pro

Jason House wrote:
> 
> Shortly after discovering some timing problems with Ethereal and
> NetXray, I tried to verify the timing factors listed.  Unfortunately,
> the supplied correction factors were still off by about 10 seconds per
> day.  Calculations yielded a value of 0.8382229.  Currently I don't know
> much about what it was captured with other than "It was captured on a
> Dolch machine running Windows ??"  A filtered portion of the capture
> file is attached.
> 
>   ------------------------------------------------------------------------
> 
> Subject: Re: NetXRay timing base
> Date: Thu, 08 Feb 2001 14:52:47 -0500
> From: Shawn Duffalo <sduffalo@xxxxxxxxx>
> Organization: The MITRE Corporation
> To: Jason House <jhouse@xxxxxxxxx>
> References: <3A8159CD.2FABDF04@xxxxxxxxx>
> 
> the factor appears to always be 0.8382229, which is about 10 sec per day off of
> the numbers you have below.  not sure i know why but it would get close enough
> for any analysis we would want to do
> 
> Jason House wrote:
> >
> > There are two candidate bases in the mailings sent out.
> > A numerical based estimate is 88/105 (=.8380952...) correction factor.
> > Another guess is .838096.  That number is based on similarity to
> > something else...
> >
> > I don't expect you to differentiate the two, just see if what you have
> > appears to match.  The two estimates will diverge from each other by a
> > second on a 2 week capture file.
> 
>   ------------------------------------------------------------------------
> 
>   Shawn Duffalo <sduffalo@xxxxxxxxx>
>   Systems Engineer
>   MITRE Corporation
>   W072
> 
>   Shawn Duffalo
>   Systems Engineer    <sduffalo@xxxxxxxxx>
>   MITRE Corporation
>   W072
>   12 Christopher Way  Work: 732-389-6542
>   Eatontown
>   NJ
>   07724
>   Additional Information:
>   Last Name     Duffalo
>   First Name    Shawn
>   Version       2.1
> 
>   ------------------------------------------------------------------------
>                                          Name: NtdrTesting_Dasb_Wed_1803-1859.cap
>    NtdrTesting_Dasb_Wed_1803-1859.cap    Type: application/x-unknown-content-type-capFile
>                                      Encoding: base64