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2017-07-15 20:17:46TCP works in the Transport layer, IP in the Network layer, and ARP in the DataLink layer; The data on the second layer is called Frame, the data on the third layer is called Packet, and the data on the fourth layer is called Segment. At the same time, we need to simply know that when data is sent from the application layer, header information will be added to each layer, encapsulated, and then sent to the data receiving end. This basic process you need to know, that is, every data will go through the process of data encapsulation and unencapsulation.So here, We configure a rule on 156, All messages on 192.168. 1.146 are denied access to the current machine, I've been saying before, The rule consists of matching conditions and actions. In the rule of "denying all messages on 192.168. 1.146 access to the current machine", the "source address of the message is 192.168. 1.146" belongs to the matching condition. If the message comes from "192.168. 1.146", it means that the matching condition is met, while "denying" the message belongs to the corresponding action. OK, how to define this rule with commands? Just use the following commandIn the above figure, using the-A option, It means "adding rules" in the corresponding chain, and-A means append, so-A INPUT means adding rules in the INPUT chain, while the-I option used in the previous example means "inserting rules" in the chain. As you must understand, their original intention is to add a rule, but-A means adding rules at the end of the chain, and-I means inserting rules at the beginning of the chain.高阳跟父亲从小不对付。高斌一个人把儿子带大，高阳却跟爹没大没小，直呼其名，态度好时也就叫个“斌哥”。他三天一翘课，五天一干仗，疯狂试探老师和父亲对他的忍耐底线。虽然校长的女儿金贝贝对他很有好感，但他却追着班花跑，班花一走，他的心也跟着飞到了北京。回到学校的高阳并没有消沉太久，金贝贝和田梦告诉他，虽然班花转走了，但有个更漂亮的大美女要来班里了，她叫叶晓文。高阳偷偷去办公室瞥见了转学生的样貌，果然人如其名，高阳怦然心动。令他没想到的是，走进班里的叶晓文竟是个男生！也许此刻依偎在他怀里是最幸福的事情。