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STM32F407 Ethernet interface problem

Question asked by John Matus on May 14, 2014
Latest reply on May 22, 2014 by John Matus
I have a board based on the STM32F407 with a LAN8710A phy.
I have ported part of the Nichelite IP stack and got it to work when the board is connected directly to the test PC via a non-crossover cable.
When an Ethernet switch is inserted between the board and the PC, then the PC does not receive any data from the board. The board however receives all data sent from the PC. I have tested this with ARPs and Pings.
Can anyone suggest why might the ethernet switch blocks the return messages?
Can anyone please post the values for the MAC configuration registers that work reliably when connected to a 100Mb/s network switch or PC?