[lwip-users] Is this duplicate data

[yueyue papa]

Hi All

lwIP IP 1.4.0 is used.  I meet a duplicate data problem in two way TCP communication.  The communication is in the GPRS network.

Client is running lwIP.

C--> S
C<-- S    inform 1
C--> S
C<---S    inform 2

In the normal,  client should get inform 1, 2.

But in certain case:  client get 1, 1, 2

The problem pcap:   dalian0109-1-2.pcap 
The good pcap:         dalian0109-1-4.pcap

In dalian0109-1-2.pcap, line 8,  is the extra data client get.  I did not known the package is reasonable or not reasonable.  It has different sequence number.


Lee

dalian0109-1-2.pcap
Description: Binary data

dalian0109-1-4.pcap
Description: Binary data