[lwip-devel] [bug #27209] tcp_input discards frames even though they are within the announced window

[Åke Rehnman]

Follow-up Comment #13, bug #27209 (project lwip):

Can someone have a look at the latest capture.

7) At no7 window is updated to 18815.

After that there are 12 frames * 1460 = 17520. The packet no9 is lost.

20) At no20 we get the first ack for frame no9 (which was lost)

21) An other 2 acks for no9

23) At no23 retransmission of frame no9. Here our window should be
18815-12*1460=1295

24) An other ack for no9

25) Next segment (number 13 after our window update). Here the other end is
overrunning or window.

I added a debug message where rcv_wnd is decremented and this is what I got:

tcp_receive: rcv_wnd < tcp_len seqno 1295 1460 1209348364

So why is our window overrun?




(file #18552)
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Additional Item Attachment:

File name: rcv_wnd_bug2.pcap              Size:29 KB


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