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When the client SYN packet arrives at the filter gateway, the SYN agent does not forward the SYN packet, but actively replies the SYN/ACK packet to the client in the name of the server. If the client's ACK packet is received, it indicates that this is normal access. At this time, the firewall sends the ACK packet to the server and completes three handshakes. The SYN agent actually replaces the server to deal with SYN attacks. At this time, the filter gateway itself is required to have strong ability to prevent SYN attacks.(Postscript: I have gone through a wide spectrum of feeling during this experience of mud-dyeing. The traditional method was killed alive because in love with it. As for us, we will go on sharing about plant-dyeing to let everyone know how nature has already provided us with everything we could ask for. To include,网飞冲击今年第一部韩剧热门！ 经典丧尸片套路刻画人性好与坏 剧情流畅不拖拉，密集恐惧的开头 不得不说网飞近几年翻拍漫画的质量真的高！又寒暄两句，方起身告辞，并让他们姐弟闷了就去张家或者郑家玩。但说到这个，我还真有主意。徐文长终于松了一口气。How to use the Word column? The so-called column splitting is to set all pages or selected contents of Word documents to multiple columns, thus presenting the column splitting typesetting effect often used in newspapers and magazines.