Thanks to all! Following links to similar products, I found this:
https://www.amazon.com/Dualcomm-DCSW-1005-Powered-Ethernet-Mirroring/dp/B00=
2BSF112
.. I think I'll suggest customers buy this when debugging in the field.

The Throwing device is interesting, but it requires two Ethernet ports on
the system running Wireshark.

I've seen the diode circuit before, and it is REAL interesting! I wonder
if anyone is manufacturing that.

THANKS!

Harold



> This might even be better/cheaper:
>
> https://www.amazon.com/Throwing-Original-Monitoring-Ethernet-Communicatio=
n/dp/B077XY2TGD
>
>
> On 08/30/2018 09:13 AM, mike brown wrote:
>> This should do what you want.
>>
>> https://www.amazon.com/Dualcomm-DCSW-1005-Powered-Ethernet-Mirroring/dp/=
B002BSF112
>>
>>
>>
>> On Thu, Aug 30, 2018, 04:45 Isaac M. Bavaresco
>> <isaacbavaresco@gmail.com>
>> wrote:
>>
>>> Use Cain&Abel (or other hackering software) to turn a switch into a hub
>>> by
>>> ARP Spoofing/routing table overflow.
>>>
>>> Em qui, 30 de ago de 2018 02:46, Harold Hallikainen <
>>> harold@mai.hallikainen.org> escreveu:
>>>
>>>> I have a hub here that I use all the time with Wire Shark. Sometimes I
>>>> need to help someone debug something in the field, and they don't have
>>>> a
>>>> hub, and they are getting hard to come by.
>>>>
>>>> Since 10/100 Ethernet uses two pair, one for transmit, and one for
>>>> receive, it SEEMS like it should be possible to make a resistive hub
>>> where
>>>> each transmit pair drives the receive pairs of the other two ports
>>>> (total
>>>> of 3 ports). I've done similar resistive networks for audio splitting
>>>> while maintaining impedances. But, I haven't figured out whether this
>>>> would work or what the resistor values would be. I did find a passive
>>>> hub
>>>> using a bunch of diodes, but it seems like resistors should work. I
>>>> also
>>>> see Ethernet taps where there are four ports. Data going one way
>>>> between
>>>> the other two ports shows up on one of the monitor ports while data
>>>> going
>>>> the other way shows up on the other monitor port. This requires two
>>>> Ethernet ports on the computer running WireShark, which is a pain.
>>>>
>>>> So, any ideas on this? Is it possible to use resistive splitters to
>>>> make
>>> a
>>>> passive hub?
>>>>
>>>> Thanks!
>>>>
>>>> Harold
>>>>
>>>>
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