Re: [lwip-users] initialisation of lwIP

[Sam Jansen]

franz keuner wrote:
>   IP4_ADDR(&gw, 192,168,0,200);                           
>   IP4_ADDR(&ipaddr, 172,16,2,6);                          
>   IP4_ADDR(&netmask, 255,255,255,0);

Note that your IP address and gateway are on different networks here! 
You can't do that. That isn't the problem that you are reporting yet, 
but it will be in the future if you continue using those IP addresses.

>   
>    printf("\nbringing up ethernet interface.\n");
> 		                 
>
>   netif_set_ipaddr(ethif, &ipaddr);
>   netif_set_netmask(ethif, &netmask);
>   netif_set_gw(ethif, &gw);
>   netif_set_up(ethif);

...

What is ethif set to? Is it valid memory?

> So the addresses aren`t the same. That`s what I don`t unterstand.

Looks like something is quite broken here. The addresses are passed 
through and printed out unmodified in netif_set_ipaddr and so on.

Why don't you try printing out the value of the ip addresses gw, ipaddr, 
and netmask before calling the netif_ setup functions? They should be 
correct, and if so, it would seem likely that the only possible point of 
failure is your "ethif" pointer being somehow invalid (you can use 
ip_addr_debug_print(debug, ipaddr)).