To run this example, it's recommended that you have an official ESP32 Ethernet development board - [ESP32-Ethernet-Kit](https://docs.espressif.com/projects/esp-idf/en/latest/hw-reference/get-started-ethernet-kit.html). This example should also work for 3rd party ESP32 board as long as it's integrated with a supported Ethernet PHY chip. Up until now, ESP-IDF supports up to four Ethernet PHY: `LAN8720`, `IP101`, `DP83848` and `RTL8201`, additional PHY drivers should be implemented by users themselves.
Besides that, `esp_eth` component can drive third-party Ethernet module which integrates MAC and PHY and provides common communication interface (e.g. SPI, USB, etc). This example will take the `DM9051`, `W5500` or `KSZ8851SNL` SPI modules as an example, illustrating how to install the Ethernet driver in the same manner.
The ESP-IDF supports the usage of multiple Ethernet interfaces at a time when external modules are utilized which is also demonstrated by this example. There are several options you can combine:
* Internal EMAC and one SPI Ethernet module.
* Two SPI Ethernet modules of the same type connected to single SPI interface and accessed by switching appropriate CS.
* Internal EMAC and two SPI Ethernet modules of the same type.
When using two Ethernet SPI modules at a time, they are to be connected to single SPI interface. Both modules then share data (MOSI/MISO) and CLK signals. However, the CS, interrupt and reset pins need to be connected to separate GPIO for each Ethernet SPI module.
See the [Getting Started Guide](https://docs.espressif.com/projects/esp-idf/en/latest/get-started/index.html) for full steps to configure and use ESP-IDF to build projects.
(For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you as soon as possible.)
