On 01.04.2018 01:26, Oldrich Kepka wrote:
we run lwip-1.4.0 on PPC440 and experience rare random hanging of TCP

Two things that I think are worth noting:
a) 1.4.0 is really old. There have been numerous fixes since that. Can you reproduce the issue with current git master? b) 1.4.0 does not contain a file called tcp_impl.h. Although, both tcp_impl.h and opt.h are stack-internal files that should not be changed. Why did you attach them to your mail?

Simon

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