Hi, there are many reasons why that can happen. You should tell which application you are running, so we can have less stuff to guess at. My best (probably educated) guess is that frame 1513 got lost "somewhere". "Somewhere" here can be: - your transmitter, which is... - your network - your hardware, which is... - your link-level driver, which is... - lwIP, which you shouldn't have this problem, unless you don't call it properly. You are not calling the stack from within interrupt code, aren't you ? It is not safe unless you know exactly what you are doing
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