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[lwip-users] TCP Zero Window

From: norbert . kleber
Subject: [lwip-users] TCP Zero Window
Date: Fri, 09 Sep 2016 10:18:29 +0200
User-agent: Roundcube Webmail/1.2.0

Hi all,

I have a small question. Under which circumstances does the lwIP stack reduce the window size even while the window update is disabled.

I am sending 16 kB to the microcontroller (lwIP-Stack) copy them to a certain address and send them back to the laptop (linux). At the end of the 66th receive cycle i receive an unexpected package and with the acknowledgement the lwIP stack reduces the window size by the length of the last 2 received packages. Afterwards we receive another unexpected package that is equal to the length of the window. From this point on the stack sends all 16 kB back and advertises the window size 0. The stack doesn't recover from that and will only send zero windows afterwards. A change of the amount of buffers and the size of them had no influence on this problem.



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