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Another form of SYN flooding attack is IP address spoofing. It is a little more complicated than direct attack. Attackers must also be able to replace and regenerate the original IP message with valid IP and TCP message headers. Today, there are many code bases that can help attackers replace and regenerate original IP messages.Objectively Down (ODOWN for short) refers to the judgment of server offline obtained by multiple Sentinel instances after making SDOWN judgment on the same server and communicating with each other through SENTINEL is-master-down-by-addr command. (One Sentinel can ask another Sentinel if the given server is considered offline by sending the SENTINEL is-master-down-by-addr command.)Jiang Xiaolong picked up a harpoon and jumped onto the raft. Ding Yumin and Ding Yumin were also planted in the water. Jiang Xiaolong was very angry and cursed Ding Yumin. He didn't expect Ding to run away. They had hijacked the boat together.　　不知是上天开了个玩笑，还是小鬼作祟，她和他再一次不期而遇。你后来一直追着我打杀，洪少爷能作证……板栗截断他话：第六——他环视厅中诸人，一字一句咬牙道——小子没有杀人。闪电侠第八季