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RP2040 Minimal hardware (PIO) Ethernet interface + LwIP TCP/IP stack driver

This library allows you to add Ethernet 10Base-T compatible connectivity to your Pico at the cost of some passive components. It uses the proven TCP/IP lwIP stack provided in the latest RP2040 SDK. It is therefore compatible with programs written in polling mode for the Pico W or existing lwIP apps and code.

It is not recommended to connect the electronic assemblies described on this page to equipment that uses or provides Power over Ethernet (PoE).
It is not recommended to connect to Ethernet without an isolation transformer, it’s electrically insecure and will result in more lost frames!”

Link to article