At the angle of the protocol analysis, a ICMP attack case is described the characters of attack are abtained and the corresponding countermeasures are presented.

• 然后在此基础上,从协议分析的角度出发,对一个ICMP诱骗端口扫描攻击案例进行了详细描述,得出了攻击特征,并提出了相应的解决办法。