[lwip-users] connection request dropped in IP layer

[Luigi]

Hi,

I'm trying to create a comunication between a client and an echo server;

but there is a behaviour of the server that I don't understand, the packet of the connection request from the client is dropped when is received from the server, it seems that the packet isn't for the server.

That is what I wrote in my programs:

 

/* for the client */

 

...

 

 mem_init();
 memp_init();
 pbuf_init();
 netif_init();
 ip_init();
 tcp_init();
 printf("stack TCP/IP initializzato.\n");

 

 IP4_ADDR(&GateWay, 192,168,0,2);
 IP4_ADDR(&IP, 192,168,0,1);
 IP4_ADDR(&NetMask, 255,255,255,0);

 

 netif_add(&Net, &IP, &NetMask, &GateWay, NULL, clientif_init, ip_input);

 

 netif_set_default(&Net);

 

 cli_init(pcb);

...

 

void cli_init(struct tcp_pcb *pcb)
{
 struct ip_addr IPDest;

 IP4_ADDR(&IPDest, 192, 168, 0, 2);

 

 pcb = tcp_new();

 

 tcp_connect(pcb, &IPDest, 5000, &cli_connected);

}

 

...

 

/* for the server */

 

...

 

 mem_init();
 memp_init();
 pbuf_init();
 netif_init();
 ip_init();
 tcp_init();
 printf("stack TCP/IP initializzato.\n");
 
 IP4_ADDR(&GateWay, 192,168,0,1);
 IP4_ADDR(&IP, 192,168,0,2);
 IP4_ADDR(&NetMask, 255,255,255,0);

 

 netif_add(&Net, &IP, &NetMask, &GateWay, NULL, serverif_init, ip_input);
 
 netif_set_default(&Net);

 

 srv_init();

...

 

void srv_init(void)
{
 struct tcp_pcb *pcb;

 

 pcb = tcp_new();
 tcp_bind(pcb, IP_ADDR_ANY, 5000);
 pcb = tcp_listen(pcb);

 

 tcp_accept(pcb, srv_accept);
}

 

...

 

I don't understand where is the error, there is someone that can help me?

 

thanks.

 

Luigi