smurf攻击是很简单的，它有一些IP（广播地址）地址列表，发出了一些伪造的数 据包（ICMP echo request）从而导致一场广播风暴，可以使受害主机（使它成为伪造包 的源地址）崩溃。-smurf attack is very simple. It has some IP address list and can send pseudo ICMP echo request. As a result, broadcast storm will occur.