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.
基于源地址欺骗的网络攻击已成为当前网络安全最主要的威胁之一。
The network attacks based on the source address spoofing have become one of the most grievous threats to the network security.
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