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Use the-S option to indicate the "source address" in the "matching condition", that is, if the source address of the message belongs to the address corresponding to-S, then the message meets the matching condition, and-S means source, indicating the source address.老汉这辈子见过的最大官儿就是清辉县令。The principle is that syn messages are first responded to syn_ack by DDOS protection system. With a specific sequence number (recorded as a cookie). The real client returns an ack and the Acknowledge number is cookie+1. The fake client will not respond. In this way, we can know that the clients corresponding to those IP are real and add the real client IP to the white list. The next access passes directly, while other forged syn messages are intercepted. The following is a schematic diagram of protection:?　　在这一季中Clark将面临有史以来最艰难的挑战。Bizarro是专为摧毁Clark而制造的，因此势必要斗个你死我活；可怕的事故夺去了Clark 的挚爱；Clark的养母Martha (Annette O'Toole饰, "超人II")离开了华盛顿；而最大的考验则来自Clark19岁的姐姐，女超人Kara（新人Laura Vandervoort饰）。李敬德低声对堂哥道：敬文哥，你干脆做一首诗，说想她想得茶饭不思……李敬文横了他一眼。Three: Understanding Modular Mode