Re: [lwip-users] SYN/ACK issue in TCP client/server implementation under eCos with LwIP-TCP/IP stack on ARM Evaluator 7T board

[Kieran Mansley]

On Sun, 2007-03-04 at 23:20 -0800, Ashish Anand wrote:
> I have a PPP link between 192.168.1.3 (Linux) and 192.168.1.4 (ARM 7 ET board
> with eCos and LwIP)
> 
> Case 1: Board is a TCP server
> 
> Linux --> Board: SYN
> Board --> Linux: no reply 
> 
> Case 2: Board is a TCP client
> 
> Board --> Linux: SYN
> Linux --> Board: SYN, ACK
> Board --> Linux: no reply, Linux retransmits initial SYN once only
> 

Sounds like you've got some problem with your receive path.  Can you
ping the board for example?  I suggest turning on some of the debugging
statements in lwIP to try and trace what happens to the packets the
board receives.  

Kieran