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The algorithm takes advantage of the retransmission characteristics of TCP/IP protocol. When the first syn packet from a certain source IP arrives, it is directly discarded and recorded in the state (quintuple). When the second syn packet from the source IP arrives, it is verified and then released.誰もが安息の場所だと思っている家族…。　　当他们进入后发现，这里竟住着一个凶残嗜血且变态失常的邪恶家族。他们的到来，无异于羊入虎口……18The SSDP reflection attack takes advantage of the protocol vulnerability of the SSDP server, an application layer protocol that is one of the core protocols of Universal Plug and Play (UPnP) technology, By sending a query request to the default port 1900 of the SSDP server's IP address to forge the victim's IP address, the attacker causes the SSDP server to reflect back a reply packet several times larger than the original packet to the victim's IP address, thus carrying out a reflection attack.