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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.兴趣所致，可以和叫花子比喝酒。1949年10月1日新中国成立，解放军即将入川，然而，国民党保密局站长何琳在马仁峰的指挥下做垂死挣扎！在蒋介石的最高指示下对蓉城实施大爆炸，在蓉地下党组织惨遭覆灭，与即将入川的解放军失去了联系！小组唯一幸存者叶雅颖接到指示唤醒在国民党潜伏多年的“磐石”，惊然发现“磐石”就是亲兄叶宇飞，而他们的父亲正是国民党叶泽宏将军。父亲也早已对蒋政府心生厌倦，成功接受策反，为和平解放成都打开了第一道大门。叶家兄妹受到了保密局的高度怀疑。蓉站站长何琳与叶宇飞曾是抗日战争时期的恋人和战友，却因两人信念不同，何琳由爱生恨，屡次对兄妹俩痛下毒手。此时潜伏下来的何琳企图暗杀进城解放军首长，并与叶宇飞同归于尽，叶宇飞绝地反击，终结了何琳的生命。最终成都和平解放了，叶宇飞及其地下党人，注视着入城的解放军队伍和欢庆的人民，留下了灿烂的微笑！At the end of these days, the yard is full of our achievements. Everyone is very happy. Ping Jie's brother suggested to have a bar for dinner. He also went to his cousin's house a few kilometers away to get two cans of rice wine made by himself. We also came to our strength and cooked our own food. Each of us showed his skill in cooking a dish. At the dinner table, a few glasses of wine went down and everyone talked a lot. (In fact, the degree of this wine is not low, ha ha.)她一边思索，一边就把这方子拟成了“霁月四虎”是四个好勇的年轻人，因常常闹事而成为霁月小区一带居民的公害。某天，老大赵春明突然拣回来一个弃婴。四个小伙子面对这突如其来的婴儿束手无策，为了要不要收这个孩子，四人发生了激烈的争执。就在四人无计可施的时候，他们突然发现，孩子居然还患有先天性心脏病。为筹措医药费，四人想尽了各种办法。 为了能够抚养婴女简盈，四个年轻人决定找一份正式的工作。而霁月小区的居民也将四虎的转变看在眼里，不记前嫌地悄悄地关心着四个年轻人的成长。