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How can I see traffic between two devices on the same network

Hi,

I have a home router - 192.168.0.1 I have a windows tablet PC - 192.168.0.12 I have another laptop - 192.168.0.10 My main laptop with Wireshark is 192.168.0.2

Devices can either be WiFi or Ethernet but all are on the same network using the same router.

When I ping from 192.168.0.2 to anything else or vice versa back to 192.168.0.2 and use Wireshark I can see the traffic. Specifically I am constantly pinging or performing a 'ping of death' between devices. I can see the long list of pings, no problem.

However, if I ping between 192.168.0.10 and 192.168.0.12, then use my Wireshark machine I cannot see any traffic between those two devices.

It seems I can only see this type of traffic when my Wireshark machine is some how involved of part of the ping process.

Help??

Stu