Hi Folks, I've designed a board with a V4FX60 using xps_ll_temac_v1_00_b and LWIP v3.0 in raw api mode. The board acts as a server. The design is implemented with ISE9.2 SP3 and EDK9.2 SP2. It seems that the stack does not see a ACK from the computer because the stack makes TCP retransmission.
Here is the packet capture, the board has the 10.0.0.101 IP, the computer has the other one: