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Suppose the attacker is in an "interconnected" network (e.g. An Autonomous system? System), whose ISP restricts the input and output filtering of the attacker's network traffic, will be able to prevent this spoofing attack-if this method can be deployed to the correct location by the organization. This defense method of traffic input and output filtering will restrict some legitimate communications, such as the mobile IP triangular routing operation mode, so it cannot be widely deployed. IP Security Protocol (IPsec) also provides an excellent way to resist spoofing packets, but this protocol cannot be used due to deployment restrictions. Since it is usually impossible for the server side to require the ISP of the link initiator to implement address filtering or require it to use IP security protocols, more complex solutions are needed to resist this spoofing attack disguised as multiple addresses, which will be discussed later.Now, let's imagine why these "checkpoints" are called "chains" in iptables. As we know, The purpose of a firewall is to match "rules" for passing messages, Then execute the corresponding Action, So, when the message passes through these checkpoints, You must match the rules on this level, However, there may be more than one rule on this level, But there are many rules, When we put these rules in a chain, A "chain" has been formed. Therefore, we imagine each "checkpoint" as shown in the following figure. In this way, it is more appropriate to call them "chain". Each message passing through this "checkpoint" must match all the rules on this "chain". If there are qualified rules, the corresponding actions of the rules will be executed.2-3;5.2 Abnormal behavior and unqualified morbid personality.住在小女孩小米（金赛纶饰）隔壁的当铺大叔（元斌饰）除了做生意之外和邻居们从不来往，颓废的造型以及沉默的性格让人们对于他的身份有诸多怀疑。天真的小米却从不理会这些传言，时常造访这位神秘邻居，竟然使他俩慢慢的成为朋友。小米的妈妈牵连到黑帮的毒品抢夺，最终使自己和小米陷入危险之中。目睹小米和妈妈被人绑架的当铺大叔为了救出小米和她的妈妈，开始和黑道展开斗争。此时，警方也在着手调查这起案件，当铺大叔车泰锡的真正身份慢慢浮出水面。被摘除所有值钱器官的小米妈妈的尸体在一辆汽车的后备箱里被发现，但是和她一起失踪的小米却依然下落不明……想要有大的作为怕是做不到，只是魏国地不只是有一个魏王豹，还有些别的人该需要注意一下。将门虎女，容不得第二个女人跟她分享男人。