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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.Detecting CSRF vulnerabilities is a complicated task. The simplest method is to grab a normally requested data packet, remove the Referer field and resubmit it. If the submission is still valid, then the existence of CSRF vulnerabilities can basically be determined.他默默地对着森林深处念道：小葱，自小你就能干，哥哥相信你肯定能闯过这关的，咱们一家人肯定能在京城团聚的。This is a concrete example of countering input: a few years ago, a smart spammer realized that if the same multipart attachment appeared many times in an email, Gmail would only display the last attachment visible in the screenshot above. He weaponized this knowledge, adding the invisible first multipart, which contains many famous domains, in an attempt to evade detection. This attack is a variant of the attack class called keyword padding.(2) A taillight.