本文将向你展示，Linux的网络堆栈的一些怪异行为（并不一定是弱点）如何被用于邪恶的或者是其它形形色色的目的。在这里将要讨论的是将表面上看起来合法的Netfilter hook用于后门的通信，以及一种使特定的网络通信在运行于本机的基于Libpcap的嗅探器中消声匿迹的技术。-This article will show you, Linux network stack a number of bizarre behavior (not necessarily a weakness) to be used for evil, or other various purposes. To be discussed here is seemingly legitimate Netfilter hook for the back door of communication, as well as a way for specific network traffic running on the machine-based Libpcap disappeared in the sniffer technology.