Salut Vincent,

On Thu, May 17, 2012 at 12:35:10AM +0000, vincent cui wrote:
> 
> [...]
> I found that it takes a 1 or 2 seconds to open connect successfully .
> [...]

It looks like a not acknowledged SYN packet, which might be dropped 
somewhere from your PHY to lwIP TCP and which is then sent again by your 
TCP client, use Wireshark and check the TCP flow ! :-)

Sylvain

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