Hi, I'm playing with a STM32 Nucleo-429ZI board. I tried the basic examples (led, serial, ADC) and they work fine. But I cannot run the Ethernet-based examples. All of them fail to connect to my LAN (either static or DHCP). Of course the ethernet cable is ok and the same example with a standard Arduino Ethernet board works fine.
Is there something to set or tweak to enable ethernet communication on Nucleo boards?
Did you use the STM32Ethernet library? Have you also add the LwIP library?
sstaub:
Did you use the STM32Ethernet library? Have you also add the LwIP library?
I said I missed something! 
I just added the Nucleo boards using the https://github.com/stm32duino/BoardManagerFiles/raw/master/STM32/package_stm_index.json link in preferences, then I opened the examples under "Examples for any board" like "Web Client". Compiled and uploaded.
Are you saying I need to change something in the examples or I have to add the libraries with library manager?
Fixed. I had to manually add both STM32 Ethernet library and LwIP libraries. Thank you for putting me on the right way.
I have made some changes to Ethernet library which are not yet released, so it must installed manually.
There are some alternative begin functions, which allows you to start with build in MAC address of the board.
Thanks for pointing it out. By the way I didn't realized you are a contributor of the code: thank you very much for your work!