How to connect STM32F407 to PC using ethernet connection?

I have a project to connect STM32F407 Discovery board to PC via ethernet. I have tried to use LwIP and LAN8720 for my external PHY with RMII. But i still cant managed to connect or ping directly to my pc. I have configured the IP to use DHCP or static, but still cant connect.

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I connect my LAN8720 to my pc directly using straight cable confifuration, as far as i know, LAN8720 have feature called Auto-MDIX so for the cable wont be a problem i think. Any suggestion?

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Thank you​