另一些方法基于IP地址和数据报长度的统计特征，但这些方法在IP地址欺骗攻击时检测率急剧下降。
Other detection methods are based on the statistics of IP addresses and the length of data packets, but their detection accuracy declines rapidly under the IP spoofing attack.
一个IPS系统可以监控异常的行为，发现非常隐蔽的基于HTTP的攻击，以及来自远程调用过程、Telnet和地址解析协议欺骗的攻击。
An IPS monitors for behavior anomalies that indicate hard-to-spot HTTP-based attacks and those from remote-call-procedure, Telnet- and address-resolution-protocol spoofing, among others.
大量的攻击机器且使用源地址欺骗使得现有的跟踪是不可能的。
The large number of attacking machines and the use of source IP address spoofing make the traceback impossible.
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