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I have a board (with FPGA) connecting to a windows 10 host through a 10G NIC. The board is set to static IP 10.254.210.10 & the host is 10.254.210.11. I can see the UDP packets in wireshark but it is not pass through to the sockets. UDP packet not able to capture through socket

a) I tried UDP server with socket bind to INADDR_ANY and port 2222. The host has another WI-FI NIC(192.168.x.x). We can capture the packet through sockets when it is entering through this interface. So, I guess it is not a firewall issue.
UDP packet able to capture through socket

b) I created a raw socket but still couldn't capture the packet observed in wireshark. Enabled promiscuous mode.

// enable promiscuous mode
    DWORD dwValue = RCVALL_ON;
    DWORD dwBytesReturned = 0;
    if (WSAIoctl(s, SIO_RCVALL, &dwValue, sizeof(dwValue), NULL, 0, &dwBytesReturned, NULL, NULL) == SOCKET_ERROR)
    {
        
        sprintf(err_msg, "Error to set in promiscous mode: WSAIoctl returned error code %d\n", WSAGetLastError());
        printf("Ioctl failed with error code : %d", WSAGetLastError());
        fwrite(err_msg, sizeof(err_msg), 1, fp);
        closesocket(s);
        WSACleanup();
        exit(EXIT_FAILURE);
    }
    puts("Ioctl done\n");

c) netstat doesn't show any errors in "UDP STatistics for IPv4"

d) Both IP checksum and UDP checksum is set to 0000 (i.e disabled).

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  • You can only disable UDP checksums by setting it to 0000 per RFC768, but not IP header checksums. Setting the IP header checksum to 0000 does not disable it; it makes it invalid (unless it really was 0000 to begin with). Commented Dec 3, 2022 at 17:53
  • @ChristopherMaynard: Thank you for looking at my question. I tried to include the checksum and it resolved the issue :) Commented Dec 5, 2022 at 15:53
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