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《犯罪心理》讲述了美国联邦调查局总部下属的行为分析科部门（简称“BAU”）中，行为分析师们剖析最棘手的案件，分析凶手的心理和作案特征，并在他们再次施暴前预测出他们的下一步行动，协助当地警察捉拿凶手。In the last article, we have learned how to use the iptables command to view rules, so in this article we will summarize how to manage rules.未来某时，一种丑陋凶恶、仿佛来自地狱的怪物肆虐人间，大肆屠杀人类。某小镇在怪物的荼毒下宛如一座死城，生存者战战兢兢，惶恐度日。Basic Protection: That is, the traditional physical protection measures for safety, But not limited to physical defense, as well as management, Policy, software defense, Even protection against a security baseline should be counted as part of the base protection, As mentioned earlier, blocking is not as good as dredging. However, this does not mean that there is no need to block. In other words, the attack time added by basic protection to the attack source, as well as the shorter detection time and the shorter emergency time, can ensure the basic information security of an enterprise. The longer the attack time, the shorter the detection time and the shorter the emergency time, the lower the possibility of successful APT attack.Here, the filter gateway mainly indicates the firewall, and of course the router can also become the filter gateway. Firewall is deployed between different networks to prevent foreign illegal attacks and the leakage of confidential information. It is located between the client and the server. Using it to protect SYN attacks can play a very good role. Filter gateway protection mainly includes timeout setting, SYN gateway and SYN agent.翘儿咧嘴笑道，他就怕我糙了，不好嫁。Virtualenv wrapper makes virtualenv easier to use, so we installed it together.