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After executing the command to add rules, look at the INPUT chain again and find that the rules have been successfully "appended" to the end of the INPUT chain. Now, the first rule indicates to discard all messages from 192.168. 1.146 and the second rule indicates to accept all messages from 192.168. 1.146. What is the result? Practice shows true knowledge. I used the ping command to send a message to the 156 host again on the 146 host, and found that the ping still failed. It seems that the second rule did not take effect.To do actual combat examples in other people's blogs;In the http protocol, the http header has a continuous "\ r\ n\ r\ n" as the end flag, and many web servers will wait for the header transmission to end before processing the http requested mop information. Therefore, if the web server does not receive a continuous "\ r\ n\ r\ n", it will always receive the data and maintain the connection with the client.The teacher's qualification certificate has nothing to do with the major, and the technical secondary school diploma can be tested for the kindergarten teacher's qualification certificate.两对夫妇租了一间僻静的房子度周末，面对一个危险的秘密，他们遇到了一个奇怪的看门人。Set up the location, system form, name and contact number of the maintenance unit; Type, model, quantity and manufacturer of controller (including fire alarm, fire linkage, combustible gas alarm, electrical fire monitoring, etc.), detector (including fire detection, combustible gas detection, electrical fire detection, etc.), manual alarm button, fire electrical control device, etc.; Diagram of automatic fire alarm system.