Hello @wsuwa.1 (Community Member) and welcome to the Community :),
I advise you, when you configurated the LWIP, to get inspired form the steps described in this FAQ: How to create project for STM32H7 with Ethernet and LwIP stack working. This FAQ will help you to configure your project in STM32CubeMX for STM32H750-Discovery.
Also, you can get started with the example provided here STM32H7-LwIP-Examples.
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Kaouthar
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