Por favor, cualquiera podría ayudar en este tema. Por favo

En el siguiente código de muestra, teníamos un calcetín crudo con eth0. pero mientras ejecuta el programa, el receptor de un calcetín sin procesar recibe paquetes de eth0 y eth1 en la misma máquina (xx_86). No me queda claro por qué, podría ayudar a uno en este tema. Espero que el setsockopt no funcione correctamente OS: Fedora core 6 (2.6.18-1.2798.fc6)

Código de Sampe:

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <linux/if_ether.h>
#include <net/if.h>
#include <linux/filter.h>
#include <sys/ioctl.h> 
#include <string.h>
#include <arpa/inet.h>

int main(int argc, char **argv) {
int sock, i;
unsigned char buffer[2048];
unsigned char tbuff[2048];
unsigned char *iphead, *ethhead,*phead;
struct ifreq ethreq;

// NOTE: use TCPDUMP to build the filter array.
// set filter to sniff only port 443
// $ sudo tcpdump -dd port 443

// raw for recvfrom eth0

if ((sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_IP))) == -1) {
    perror("socket");
    exit(1);
}
  // set network card to promiscuos
strncpy(ethreq.ifr_name, "eth0", IFNAMSIZ);
if (ioctl(sock,SIOCGIFFLAGS, &ethreq) == -1) {
    perror("ioctl");
    close(sock);
    exit(1);
}
ethreq.ifr_flags |= IFF_PROMISC;
if (ioctl(sock, SIOCSIFFLAGS, &ethreq) == -1) {
    perror("ioctl");
    close(sock);
    exit(1);
}

//bind to sock with eth0 

 struct ifreq Interface;
 memset(&Interface, 0, sizeof(Interface));
 strncpy(Interface.ifr_ifrn.ifrn_name, "eth0", IFNAMSIZ);
 if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, &Interface, sizeof(Interface)) < 0)    { close(sock); }


    //open the RAW socket for sendto

 int s = socket (PF_INET, SOCK_RAW, IPPROTO_RAW);

     struct sockaddr_in sin;
     memset(&sin,0,sizeof(sin));
     sin.sin_family = AF_INET;
     sin.sin_port = htons(0);
     sin.sin_addr.s_addr = inet_addr ("10.3.161.104");

  // inform kernal don't fill IP and Transport header

     int one = 1;
     const int *val = &one;
     if (setsockopt (s, IPPROTO_IP, IP_HDRINCL, val, sizeof (one)) < 0)
     printf ("Warning: Cannot set HDRINCL!\n");

     //bind the sock descriptor with eth0

     struct ifreq Interface1;
     memset(&Interface1, 0, sizeof(Interface1));
     strncpy(Interface1.ifr_ifrn.ifrn_name, "eth0", IFNAMSIZ);
     if (setsockopt(s, SOL_SOCKET, SO_BINDTODEVICE, &Interface1, sizeof(Interface1)) < 0) { close(s); }


while (1) {
    printf("----------------------\n");
    i = recvfrom(sock, buffer, sizeof(buffer), 0, NULL, NULL);
    printf("%d bytes read\n", i);

    // check header size: Ethernet = 14, IP = 20, TCP = 8 (sum = 42)
    if (i < 42) {
        perror("recvfrom():");
        printf("Incomplete packet (errno is %d)\n", errno);
        close(sock);
        exit(0);
    }

    phead = buffer + 14; // (skip ethernet  header)
    memcpy(tbuff,phead,i-14); 
    iphead=tbuff;
    if (*iphead == 0x45) {
        int ptrindex= iphead[9];
        switch(ptrindex){

         case 1:
                printf("The transport protocl is:ICMP\n");
                break;
         case 2:
                printf("The transport protol is:IGMP\n");
                break;
        , case 6:
               printf("The transport protocol is:TCP\n");
               break;
         case 17:
               printf("The transport protocol is:UDP\n");
               break;
         case 103:
              printf("The transport protocol is:PIM\n"); 
              break; 
         default:
             printf("The transport protocol is:%d\n",iphead[9]);
        }           
        //printf("%d",*ptrindex);
       // printf("\n The transport protocol is :%u\n",iphead[9]);
        printf("Source Address: %d.%d.%d.%d, Port: %d\n",
            iphead[12], iphead[13], iphead[14], iphead[15], (iphead[20] << 8) + iphead[21]);
        printf("Dest Address: %d.%d.%d.%d, Port: %d\n",
            iphead[16], iphead[17], iphead[18], iphead[19], (iphead[22] << 8) + iphead[23]);


     if(sendto(s,tbuff,i-14,0,(struct sockaddr *)&sin,sizeof(sin))<0)
      printf("error\n");

     else{printf("\nThe received packet is send\n");}

     memset(buffer,0,sizeof(buffer));
     memset(tbuff,0,sizeof(tbuff));

    }
   else{ printf("The non ip had received");}

    }
       close(sock);
}