Sylvain wrote: > My best guess is a low level driver bug that happen when packets are > sent in a short timeframe, which big UDP packets do due to IP > fragmentation taking place. Sending small packets at a low rate does not > fix the problem, it just hides it. >
I've indicated such in the GitLab issue I had open with Xilinix. Thanks again for everyone's responses! Dan , On Fri, Feb 3, 2023 at 2:57 PM Dan Nygren <dan.nyg...@gmail.com> wrote: > Sylvain wrote > ... Anyway, basic rule about using fragmented IP packets: > avoid (to not say > don't). > > Thank you for the advice Sylvain. My design is keeping its packets under > the Ethernet 1500 octet MTU. I had made a diagnostic command to have my > design send back arbitrarily sized messages to prove everything was working > correctly when I ran into the 4385/4386 message size problem. > > Dan > > , > > On Fri, Feb 3, 2023 at 1:24 PM Dan Nygren <dan.nyg...@gmail.com> wrote: > >> Peter wrote: >> >> > 4385/4386 could be 3x MTU ? ... >> >> Peter, thanks for responding! >> Yes, it seems like I've hit some corner case. >> Is this the right place to notify the lwIP maintainers of problems? This >> is not a current problem for me as my messages are under the MTU size. I >> just hit this while developing some diagnostics for my board and I wanted >> to let others know about it. >> >> Dan >> >> , >> On Wed, Feb 1, 2023 at 2:10 PM Dan Nygren <dan.nyg...@gmail.com> wrote: >> >>> Hello fellow lwIP users. Can anyone point me in the right direction on >>> how to resolve or report to the right folks the below issue? >>> >>> I'm seeing rather bizarre behavior in that messages of length 4385 and >>> 4386 I send to a lwIP based UDP echo server are not received back. >>> udp_sendto() appears to be getting called and completing successfully. >>> Wireshark indicates there are "bogus, payload length" errors with these >>> lengths. >>> >>> I have a detailed write up showing the behavior here: >>> https://github.com/Xilinx/embeddedsw/issues/212 >>> >>> I can copy the info above into an email for this mailing list if you >>> prefer. >>> >>> Let me know your suggestions on how to proceed. ... Dan Nygren >>> >>> , >>> >>
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