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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.1. Filter gateway protection女医生Ivy因遭人强奸而陷入心绪昏乱，亦令到她错误弄至病人阿龙失忆，内疚加自责下，逃避一切赴澳门与朋友Cat居住。Ivy偶然遇上龙，被阿龙的积极态度深深感动，找回做人的自信。But this is not over yet. Ethernet also requires CRC verification when transmitting data. The network card will CRC check the data packet before sending the data, attaching a 4-byte CRC value to the back of the packet header. At this time, the packet length is no longer 40 bytes, but 64 bytes, which is often referred to as SYN packet attack. The packet structure is as follows:Zhang Hanyun在母亲被暗杀后，奎恩·索诺成长为一名出色而与众不同的间谍，尽心尽力保护非洲人民。在一次危险的实地任务中，奎恩无意中发现了母亲死亡的惊人细节，于是开始了自己的真相寻找之路。