I used to have problems like this when using certain device drivers
that would "attach" at various points to NIC drivers or other points in
the stack.
For example, using Virtual PC's virtual networking drivers, Nortel's
Contivity VPN software, and others would produce this behavior for me.
Depending on the software and platform, software like this would cause
problems for me in Ethereal/winpcap, Sniffer Pro, NI Observer, Netmon,
and others.
I'd look for something like this installed and see if there are known
issues with the product that might be resolved with an update, or if
it's something that you can remove. If you're running Ethereal 0.9.11
I'm assuming that you're also running a somewhat older version of
Winpcap. I have NO idea if there have been any changes to Winpcap that
have avoided/worked around these kind of situations, but you might
consider trying a newer version, or bringing up the question with the
Winpcap folks (particularly since if the problem is software-related or
can be fixed/worked around in software, it's almost certainly more
related to Winpcap than to Ethereal)
Otherwise, are you really connected to a hub and not, say, a small
switch? Does the connection to the hub make a difference (i.e. if you
connect to other devices, like switches, you don't have a problem)?
Ian
On Jul 20, 2004, at 1:36 PM, T. Hariharan wrote:
Hello,
When I capture packets from the ethernet interface connected to a hub,
I
see duplicates of packets sent by the laptop.
Packets received are ok - only one copy is displayed.
Every once in a while, this problem seems to go away by itself. It also
comes back.
Details:
System: Dell Latitude laptop
OS: Windows 2000
Adapter: 3Com EtherLink PCI:
\Device\Packet_{C03E0430-2F79-4150-B947-6285D725DC12}
Ethereal version: 0.9.11
Thanks for any help,
Hari
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