if ((p = (struct IPPacket *)calloc(1, sizeof(struct IPPacket))) == NULL) {
perror("ERROR: Could not allocate RST packet:") ;
Quit(ERR_MEM_ALLOC) ;
if ((p = (struct IPPacket *)calloc(1, sizeof(struct IPPacket))) == NULL) {
perror("ERROR: Could not allocate RST packet:") ;
Quit(ERR_MEM_ALLOC) ;