Zedboard UDP LwIP baremetal - outgoing packet size error

[mele14]

Hi everyone ,

I would appreciate if someone could help me solve this strange problem regarding Ethernet transmission of UDP packets in RAW mode with LwIP from Zedboard to Windows PC.

I’m using the example project in SDK to test the functionalities of LwIP called udp_perf_client.

If I try to use the project as it is  (with UDP_SEND_BUFSIZE 1440 ) Whireskark signals that packet are malformed , in fact it seems that “data bytes” are being truncated so are sent less bytes than expected (declared in the costruction of the IP header by LwIP).

In the image attached is shown the case of UDP_SEND_BUFFSIZE of 600 bytes for example.

Packets arrive successfully only if the size of the Ethernet frame is smaller than 500 bytes.

I tried to modify the LwIP options in Board Support Package without success.

I can’t address the problem .

Thanks in advance

[Wyllyam]

Hi mele14,

On the top of the ZedBoard there's a sticker with the serial number. Underneath that sticker, on the silk screen, is a revision letter.

What revision is your ZedBoard?

[mele14]

Hi Wyllyam,

 Thanks for answering my message, my ZedBoard is rev. C