Wireshark-users: Re: [Wireshark-users] Missing packet padding bytes on Mac
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From: Jaap Keuter <jaap.keuter@xxxxxxxxx>
Date: Thu, 19 Nov 2009 17:49:55 +0100
On Thu, 19 Nov 2009 09:22:50 -0500, "Tatakis, Thomas (Tom)"
<TTatakis@xxxxxxxxxxx> wrote:
> Hello,
> 
> I was recently debugging a CDP protocol issue with version 1.2.3 on a
Mac
> platform.  The device I was debugging was adding padding bytes to the
> packets to an 8 byte boundary.  These bytes did not show up in the trace
on
> the Mac platform.  However, when I used version 1.0.3 on a PC platform,
> these bytes did show up as part of the trace.
> 
> The Mac trace told me that "108 bytes on wire, 108 bytes captured" when
in
> reality there were 112 bytes sent by the device.  The length field in
the
> CDP packet only indicates 108 bytes but there are 112 bytes actually
sent
> by the device.   The PC trace did indeed indicate "112 bytes on wire,
112
> bytes captured".  I've looked for some sort of setup/configuration
property
> that might fix the problem but can't seem to find one.  Is there
something
> I am missing or is this a known problem (or an unknown problem)?
> 
> Thanks in advance for any help.
> Tom

Hi,

Sounds like an 32bit FCS at the end of the frame...

Thanks,
Jaap