Look at the source Mac addresses you see, and don't see. That should indicate whether the hub is really a switch, OR that you're only seeing packets on one direction, but not the other. Feel free to pull the "hub" out and test it separately if needed.
Sent from a device that fits in my pocket and has no real keyboard.
On Apr 21, 2012, at 3:07 PM, Phil Paradis <phil.paradis@xxxxxxxxxxxxxx> wrote:
> Are you sure it's a hub and not a switch? I've seen so-called "hubs" that
> were actually switches.
>
> --
> Phil Paradis | Network Administrator | Churchill Downs, Inc. | 700 Central
> Ave | Louisville KY | +1 502 509 7445
>
>
>
> On 4/21/12 11:25 AM, "Marius-Simion Cristea" <cristea12@xxxxxxxxx> wrote:
>
>> Hi,
>>
>> I want to capture the traffic (the commands) that are sent from a
>> SCALANCE touch panel emulator to a PLC. The configuration of my network
>> looks like this:
>>
>> Emulator---HUB---Scalance_Switch---PLC
>> |
>> PC (Wireshark)
>>
>> I'm giving commands to the PLC from the emulator, the PLC responds, but I
>> can't capture any of those commands using Wireshark, i'm seeing only ARP,
>> LLDP, PN-DCP packets and some other broadcast packets.
>>
>> Is it possible to capture those commands using Wireshark? if so, what am
>> I doing wrong? because, as far as I know the hub must send all the
>> packets that are meant for the PLC also to the PC.
>>
>> Thanks!
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>
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