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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.Wrong, wrong flight, now in Hunan Province!《青春后空翻》讲述主人公藤谷若叶受高中啦啦队"JETS"的影响，产生了将来要加入同一社团称霸全美的梦想，最终与朋友及老师们一起带领本校啦啦队，以称霸全美大赛为目标努力奋斗的故事。The four modes in the above article are all configured in mainfest's xml file, and GoogleAndroid team also provides another higher-level setting method, that is, setting the startup mode through Intent.setFlags (int flags);也许要不了多少时间，就能诞生一个新的行业——网络作家这一职业。　　不仅仅有相互之间的调侃、戏谑、捉弄，也更多了份相互鼓励、帮助、扶持。有美好，有欢笑；有失落，有惆怅；有努力，有奋斗，爱情公寓一如既往的见证了大家的青春与成长，无论是一菲、小贤、关谷、悠悠、子乔、美嘉、益达还是展博，大家的故事...本片改编自美国作家库柏“皮袜子”系列小说中的第二部。 1757年七年战争期间，英法两军在北美殖民地激战正酣。军官邓肯带队护送长官之女可娜（Madeleine Stowe 饰）前往威廉亨利堡，半路遭法属印第安人埋伏，莫希干族最后的战士——金卡加（Russell Means 饰）、安卡斯父子与白人霍克依（Daniel Day-Lewis 饰）出手相救。但抵达要塞时他们发现这里已陷入战火，要塞长官门罗与邓肯做事强硬，不肯放走民兵自降战力，并将霍克依监禁，可娜这时已同霍克依相恋，但却无力援救。英军战事不利弃堡投降，印第安人马瓜带领族人向英军寻仇，可娜与霍克依失散后被马瓜带走，霍克依、金卡加、安卡斯一