[lwip-devel] [bug #50914] TCP server don't update the ack num

[Simon Goldschmidt]

Follow-up Comment #5, bug #50914 (project lwip):

Yes. There are many "[TCP CHECKSUM INCORRECT]" packets from the PC as checksum
offloading is done after wireshark captures the local packets.

However, the retransmitted packet from the device (e.g. no. 4155) has an
invalid checksum, too. That shouldn't happen. There's something wrong in
calculating the checksum of that packet.

What's your setting for LWIP_CHECKSUM_ON_COPY and CHECKSUM_GEN_TCP? Could you
try again with LWIP_CHECKSUM_ON_COPY ==0?

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