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PROCESSOR-SDK-AM335X: Am335x dual ethernet lwip issue?

Part Number: PROCESSOR-SDK-AM335X

Hai sir,

we are using two ethernet ports and example of enetlwip code of AM335X starter ware used,

SYSTEM-A------->ETH1-Board-ETH2-------->SYSTEM B

from system A we are sending files to board and board to system B is working.it means SYSTEMA(Client)----->ETH1(Server)Board-ETH2(Client)------>SYSTEMB(Server).

it's working with dual mac mode. when one port is receiver and one port is transmitter.

But each and every packet ACK required then enet lwip board port 1 working receiver part and not transmitting.

if board port2 disabled, then port1 receive's send ACK to system A.

If i enable port 2 then port 1 only receives data not transmitting(ACK).

Could you give me some suggestions.

thanking you sir,

Regards,

Ramachandra