Re: basic usage problem

[Murilo Grizi <mbgrizi () gmail com>]

Kurt,

I use Wireshark on Windows (ok, everyone kill me) and I've had this issue
of 'packets missing' many times.

Possible causes that I identified were:
- Packet too big (had to enable Jumbo Frames on my NIC)
- NIC unable to read VLAN (had to create a VLAN tag on my board)
- Couldn't see VLAN tag on capture (had to even change the registry to do
so... BTW: on Windows XP it worked, but changing the registry didn't do
anything different on Windows 7).

I'm not sure that can help you, but, since you

2012/12/12 Bill Meier <wmeier () newsguy com>

> On 12/12/2012 11:20 AM, Bill Meier wrote:
>
> > On 12/12/2012 9:59 AM, kurt.jensen () us ophiropt com wrote:
> >
> > > Just installed Wireshark and started capture. Plugged in our GigE camera
> > > under development.  Connected and collected a frame of data.
> > >
> > > Wireshark shows all of the GVCP requests and answers.  Very nice!  But I
> > > am not seeing any of the UDP data.  I have no filters set, just selected
> > > the interface then slicked start. I have run Wireshark before on another
> > > computer where the UDP data just showed up along with the GVCP packets.
> > > I know the data is there because my PC app displays the image. But not
> > > in Wireshark.
> > >
> > > How do I get the UDP data?
> > >
> > > Kurt
> > I'm not sure I understand.
> >
> > It appears that GVCP is carried over UDP so it sounds like you are
> > saying that only certain UDP frames are missing.
> >
> > Is the "data" carried over the GVCP protocol ?
> >
> > If so, I would expect the data show up as being under the GVCP layer of
> > the protocol tree (as opposed to the frames just showing as UDP.
> > IOW: the "protocol" column would show GVCP as opposed to UDP.
> >
> > (I've no knowledge of the GVCP protocol so I may be off-base).
> Update: It seems that there's a separate protocol (GVSP) for transferring
> data so ignore my comment above.
>
> Is it possible that the data frames are being dissected incorrectly as
> another protocol by Wireshark (so that they don't show as UDP in the
> protocol column) ?
>
>
>
>
>
>
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Brasil…"
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