[lwip-users] Transport terminal Using Tcp - ask for help~

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Hello everyone:

i encounter a problem when i use tcp transport.

	No.	Time	Source	Destination	Protocol	Length	Info
(1)	256	2.210092	192.168.1.20	192.168.1.60	TCP	571	[TCP segment of a reassembled PDU]
(2)	257	2.212896	192.168.1.60	192.168.1.20	TCP	64	[TCP segment of a reassembled PDU]
(3)	258	2.414096	192.168.1.20	192.168.1.60	TCP	54	56864 → cisco-sccp [ACK] Seq=65157 Ack=1288 Win=16054 Len=0
(4)	259	7.214311	192.168.1.20	192.168.1.60	TCP	423	[TCP segment of a reassembled PDU]

 

192.168.1.20 is host(Windows) and 192.168.1.60 is my target board(lwip).

 

in (1) and (2), transport is normal.

suddenly, a ack(3) come, then transport terminal

after about five seconds later, host retransmission.

 

why do not lwip answer the ack(3) ? thanks anyway

 

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With kind regards

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田智洲

TEL : 15501024303

E-mail : address@hidden

Address : Haidian,Beijing,100091,China