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LWIP ETHERNET PROBLEM

Question asked by farm.james on Mar 11, 2015
Latest reply on Mar 11, 2015 by AvaTar
hi
i used lwip example in stm32cubef4 like to(udp echo server,tcp echo server,......).when i connect 2 stm32f407 eval boards as udp or tcp servers to ethernet hub switch and connect to pc as client my servers don't work correct.

pc(client)<----------><ethernet switch----->}{<--stm32f407 board as udp server1-->
                                                                    }{<--stm32f407 board as udp server2-->  

but the system work good when i disconnect one stm32f407 board from switch
 
pc(client)<----------><ethernet switch----->}{<--stm32f407 board as udp server1-->
why lwip lib don'twork with 2 servers in ethernet chain?
                          


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