[lwip-users] Re: reading and writing to the ethernet, unix port

[Kelvin Lawson]

> But , when I call lwip_connect(), the outgoing packet should be seen 
> by,  "tcpdump - i tap0"
> Am I right?

I'm not sure what the behaviour would be when the interface is firewalled.

> But I am able to run normal socket based client-server sample on Linux.  
> and also across, my Linux and  XP.

Do you mean you have a LWIP sample running or using the regular Linux stack?

Have you tried running the simhost sample in 
contrib/ports/unix/proj/unixsim? If not I would suggest you start there. 
Run the simhost application and attempt to ping the host at 192.168.0.2.