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[lwip-users] Duplicate sequence numbers

From: JM
Subject: [lwip-users] Duplicate sequence numbers
Date: Sun, 16 Aug 2009 19:14:23 -0700 (PDT)

I have yet another problem; I can't help but to think I have some type of compiler-related issue because of the seemingly unsolvable issues I'm having.  I just cannot get data flowing smoothly no matter what I do. 

I'm seeing "tcp_receive: duplicate seqno xxxxxx".  I'm not a TCP/IP expert, but in looking at normal traces, I see that the acknowledgment number in the ACK is the same as the sequence number in the packet being ACKed, and Wireshark clearly doesn't consider this to be a valid ACK to any previous packet.  Is there a good explanation for this?  If not, any pointers on how to track it down?  I know the stack is supposed to function; that's what makes this so frustrating. is my computer, and is lwIP 1.3.0.  
Also, are all those zeros at the end of the ACK supposed to be there? 

I've attached a trace.  Rename the extension to .zip. 

Attachment: capture.piz
Description: Binary data

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