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If the command in the above example does not use-s to specify the original source address in the corresponding rule, After the modification is completed, The source address in the rule you modify will automatically change to 0.0. 0.0/0 (this IP represents an IP address that matches all network segments), At this time, the corresponding action of-j is REJECT, Therefore, if the original source address of the rule is not specified when executing the above command, all IP requests will be rejected (because the original source address is not specified, the source address of the current rule will automatically change to 0.0. 0.0/0). If you are using ssh to remotely go to the server for iptables setting, your ssh request will also be blocked.一场突如其来的遭遇战，让退役特警施慧一展身手，制服歹徒解救人质的一瞬间，她也俘虏了刘春和高煜的心。可她却始终难忘绿色的军营，难忘那纯洁炽烈又刻骨铭心的童涩初恋，可惜情爱就如同风中弱草……Successful investment is bound to be difficult, and it is even more difficult to obtain excess returns in the long run. It will treat all styles equally. However, different investment styles and strategies are difficult in different places. I sometimes think, what is the most pitiful but hopeless person? Ignorant and incompetent? Lazy? Stupid? In fact, they are not, but they do not know good or bad. Lack of intelligence can be made up by diligence, laziness and ignorance can be made up by noble help. If you don't know the good or bad, you will be in trouble. The person who originally hurt you will be regarded as a benefactor, but he will be regarded as an enemy when he is helping you. Is there any good in this life? The point is that there are really many such people in the stock market.3. Reflect server resources, Refers to servers, hosts and other facilities that can be used by hackers to launch reflection attacks. If there are some network services they provide, which do not require authentication and have amplification effect, and are deployed in large quantities on the Internet (such as DNS servers, NTP servers, etc.), they may become network resources that are used to launch DDoS attacks.秦旷冷静下来，苦涩道：可是孩儿已经连正妃都娶了。(3) MvM