How can I communicate multiple microcontrollers with pc using ethernet cable

[RMund.1]

..

[LCE]

Hmmm, maybe via ethernet ?

;)

Maybe you give some more information ?

There are several STM32 types out there with ethernet MAC, and even some Nucleo-Boards with ethernet jack and PHY might still be available. That could be a good starting point.

[RMund.1]

Like if I want 2 STM32F745VGTx microcontrollers to communicate via ethernet, than how can I do it.

I have even changed the MAC address of both the controllers but they both re not able to ping, only the one which is connected to PC is getting pinged.

[TDK]

> only the one which is connected to PC is getting pinged.

How would the one not connected to the PC respond to a ping? What is it connected to?

Would recommend creating and showing a layout diagram of the connections. Consider using a switch between the PC and the devices to route traffic.