Thanks! I looked that up and then found similar device. It turns out that
there are a bunch of Netgear DS104s available. That happens to be what I
have here. I should probably just buy a bunch of them to loan out for
debugging Ethernet installations.

THANKS to everyone!

Harold

> You can do better than that. I have numerous old Cisco and
> Dell switches that cost less than $30 and can do port
> mirroring. (eg. Dell 2724) Check Ebay, etc.
>
> Allen
>
> -----Original Message-----
> From: piclist-bounces@mit.edu
> [mailto:piclist-bounces@mit.edu] On Behalf Of Harold
> Hallikainen
> Sent: Thursday, August 30, 2018 7:38 PM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Passive Ethernet Hub?
>
> Thanks to all! Following links to similar products, I found
> this:
> https://www.amazon.com/Dualcomm-DCSW-1005-Powered-Ethernet-M
> irroring/dp/B002BSF112
> . 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
> -Communication/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-M
> irroring/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
>>>>>
>>>>>
>>>>> --
>>>>> FCC Rules Updated Daily at http://www.hallikainen.com
>>>>> Not sent from an iPhone.
>>>>> --
>>>>> http://www.piclist.com/techref/piclist PIC/SX FAQ &
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>
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