[lwip-users] Re: Re: Re: TCP duplicate ACK

[shiyou yu]

Thank you!

Yes, you are right, 192.192.192.39 is PC's IP, and the other is my
board's.  I just have a test connecting PC and my board using a wire,
so the IP address is temporary. I think it does't infulence the test
result.

I use the modbus/TCP port from
FreeModbus(http://freemodbus.berlios.de/), just a litte change from
its lwip/MCF5235 port, lwip port from
FreeRTOSV5.1.1(Unsupported_Demos/STR9_lwIP_1_3_0_GCC_SO) and also the
FreeRTOSV5.1.1 RTOS. My board includes a lpc2214 and a enc29j60 b7 net
chip from microchip, net driver is changed from u-boot-2008-10 and
microchip tcp/ip stack. The file is a zip file of the netif driver,
but some comments in the file is written in Chinese not English, I
don't know if this can help.

I have checked modbus/TCP port and found that it use the raw api, but
run in a separate task from the tcpip thread, I don't know if this is
right. The netif ethernetif_input is also a separate task. In the
lwipopt.h file, I #define LWIP_NETCONN  1 and #define LWIP_RAW    1.

Forgive my poor English.

Thank you again for your help!

enc28j60drv.rar
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