int arp_lookup_linux(char *dev, char *ip, char *mac)
{
  FILE *fp;
  char ipaddr[100];
  char line[200];
  char hwa[100];
  char mask[100];
  char device[100];
  int num, type, flags;
  
  if(strlen(mac) > 0)
    strcpy(mac,"unkown");
  else
    return -1;