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If an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. TCP is a reliable protocol, and messages will be retransmitted at this time. The default number of retries is 5. The interval time of retries is doubled from 1s to 1s + 2s + 4s + 8s + 16s = 31s respectively. After the fifth time is sent out, it will take 32s to know that the fifth time has timed out, so the total is 31 + 32=63s.如今刚好用完，再生的话还得动脑子想。Q: Continue to explain? A: After robbing the woman in Feixian County, we stayed in Mengyin for a few days and then returned to xintai city. Zhao Mou's brother was about to get married and went back to help. Wang Jiying and I met Fu Gang while surfing the Internet. We talked for a while and Fu Gang asked me, "Are you going to be a big student?" I said "rob". Fu Gang didn't say anything again and went online with me.When traveling on icy and muddy roads, the top speed is 30 kilometers per hour.这几年打仗，苦了百姓们。3. Easy integration of other Software as a Service (SaaS) applications