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141796 2009 年 11 月 28 日 12:37 Reading (loading. ..) Comments (0) Category: cargo ship to the solution
mainframe gateway role?
not assume that your name petit point, you live in a courtyard house, your neighbor has many small partners, there is a janitor at the door, the door to see Uncle Lee, Uncle Lee is your gateway. When you want a small partner in the yard to play in the yard as long as you call out his name,
进去混早晚要还的 - Qzone日志, he heard it will respond to you, and came out to play with you.
but you are not allowed to walk out the door, you want all contacts with the outside world, must be by the door of Uncle Lee (Gateway) to help you contact by phone. If you are looking for chat with your classmates Xiao Ming Xiao Ming, who lives in another in a long courtyard, the courtyard of his house also has a doorman Grandpa Wang (Xiao Ming gateway.) But you do not know Xiaoming home phone number, but your head teacher to have a list of all the students in your class and telephone number table, your teacher is your DNS server. So you dial the door at home, Uncle Lee's phone, with the following dialogue:
small point: Uncle Lee, I want to check the class teacher Xiao Ming's phone number right?
Grandpa Lee: Well, you waiting for. (Then, Uncle Lee's class teacher you hang a phone, ask the small out phone) asked, his home number is 211.99.99.99
small point: Great! Uncle Lee, I'm looking for Xiao-Ming, and then help me to contact you about Xiaoming it.
Grandpa Lee: No problem. (Uncle Lee then sent a request to the telephone office connected to telephone requests for home Xiao Ming, the last pass of course, be transferred to a small inventor Grandpa Wang, where the yard, and then Uncle Wang Xiao Ming the phone to go home)
Xiaoming so you and made contact. The DHCP server
Well, it can be an analogy:
your yard more and more residents of a bureau of Uncle Lee's telephone exchange where so many residents can no longer meet the needs of the , so I had to use a new technology called DHCP, boot time residents were given a phone number, and each time the numbers are likely to be different.
uncle Lee in front of your home: is your gateway
your teacher: is your DNS server
janitor of the telephone exchange: is your DHCP server
above, Li and Wang uncle uncle called the dialogue between the routes.
another: If there is still a small child called dark, he lived in the yard porter is Sun uncle, because of the small courtyard just cover the dark, Sun uncle just arrived shortly after and he does not Uncle Lee Uncle Wang office phone (Grandpa and Uncle Wang Li, of course, not his phone), then there will be two situations:
1, Zhao neighborhood uncle aunt told the Sun on the Li, Wang and two uncle phone (and aunt also told Zhao Li,
Man tired to look at these!, Sun King on the phone), this is called a static set route
2, Zhao aunt was sick, Sun uncle called himself everywhere, telling anyone, said: (Little Dot) yard management calls them Sun uncle natural first notice the dark, I can tell him to go to Sun King Uncle Grandpa, you can own directly to Sun, that Sun is of course directly to their own convenience, Grandpa again calls to a small dark house.
Uncle Lee's book is called here the routing table. Uncle Lee
choose their own uncle, or directly to Sun to help divert the king uncle called routing.
Lee chose to go directly to Sun uncle uncle was justified, because he will be able to step in directly to Sun uncle in place, if you want to transfer to Uncle Wang requires two steps to complete, where fired, this is called call, Xiao Ming thought: Xiao Ming made a decision:
first call he told his Grandpa Wang, pipe yard, said: I'll pick, changed his address book, which is called routing spoofing.
Little Dot find little after dark, were transferred to Uncle Wang Li uncle (in fact should be transferred to the Sun's uncle), Uncle Wang received the call to be transferred to a small tomorrow (because of his prior Little said already good), Xiao Ming received the call to pretend to point a small dark and small non-communication. Because Xiao Ming guilty conscience, fear of tomorrow, small point and small dark after meeting face to face to ask him, and then communication cut off after they themselves to small point in the name of a small dark through a phone call to repeat it again just now, then there it is called data eavesdropping.
later, small point, or continuous and small dark contact, and scattered small Ming, Xiao Ming and thinking to himself ah: do! , how can he do? We look at:
he contacted a number of Hupenggouyou, and their collusion good a time each day, with everyone calling for small dark yard reception room, content to have everything, as long as the janitor of the Sun grandfather received phone, you will hear the , do not listen to would not work, phone keep ringing ah! Finally one day, Grandpa could not resist Sun, shouted:
This is the most simple DDOS attacks, weak mental endurance Sun grandfather phenomenon called If I would smile and they engaged in small talk, for example, tell them name how to play the other side is busy, a phenomenon called
Xiao-Ming finally quiet for a few days, ...
few days later, a small out into the courtyard to a beautiful girl called Mary, Xiao Ming is like her (a very young age to play What is puppy love!), but Mary has a handsome boyfriend, Xiao Ming can not look on in despair. Here of course still have to follow the above principles: Mary is not out of the yard. The man naturally can only be called Mary to bubble, so Xiao Ming and ready to make a:
grandfather was king of the yard still remember the phone explorer it? He is able to manage because he has a phone address book, because the same yard may have 2 children called Xiao Ming, can not be distinguished by the name, so the only two contacts on each line:
numbers ; Phone
Door No. 1234567 (This is a small specified)
Gate II 7654321 (this is Mary)
... ...
Grandpa Wang memory is not good, but it can not be wrong, right (with a yard does not have 2 II Every time people have to call the phone number to find out, and then go to the yard door contacts, such as people said I look One knock on the door
phone number here is the legend of the This is the card maker coded into the card's chip)
Xiao Ming thought, idea, through careful observation, careful preparation, he finally found the king grandfather had frequent urination problems (after all, is finally old ah ...), a dark and stormy day in a month,
我被点名了``汗`` - Qzone日志, Wang Grandpa toilet, and Xiao-Ming secretly deep into janitor's room, carefully changed the king's address book ......
grandfather a few days, Mary's boyfriend gave Mary a telephone call, the other side of the phone is reported Door 7654321 (Note: This turned out to be Mary, but was changed Xiao Ming)
......
Grandpa Wang changed ah do not know, so go One door to find a small clear, Xiao Ming heart of this beauty, ah, his father's tone of harsh Mary taught the man and Mary men and women between the improper relationship between the results of the man hung up the phone respectfully . Of course, Mary does not know the whole thing happen ...
here Hsiao Ming's behavior is called So called called
grandfather King is such a system there is a written month time limit is called the So small that in order to make that man can never be found Mary, and then once every month to secretly change the address book, but this also had to do ah!
add, Xiao Ming is a very intelligent, if the contacts (ARP table) was changed to this:
numbers (MAC) Phone (IP)
Door No. 1234567 (This is a small specified)
Gate II 1234567 (Note: This is Xiao Ming changed, but his mistakes in a moment dizziness)
......
the computer will prompt a dialog box will pop up repeat your phone. Mary knew that she was in the destruction of a good thing, this phenomenon is called Small point at home to say to tell small dark after encryption. Potato -> Wednesday, sweet potato -> treat, stupid -> small point home. So do not point to tell a small little dark: potatoes stupid sweet potatoes. Xiao-Ming listening? ? ? Do not understand. . . . Depressed. . . This is encrypted.
In addition, Mary also known to change his Xiaoming home phone number. So the king grandfather door one by one down the phone and house number. Outsiders are not allowed to modify and hide, only they have the key (password). This is the ip address and MAC address binding. When someone changes a phone number, when the king would have to find Grandpa changed. Trouble is trouble, but safe. However, Wang Xiao Ming secretly to steal the key to Grandpa with a handful of (successful theft of the password), so he can be modified.
tags Gateway DNS DHCP IP address MAC address
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