Urban Denon

Xiao Yihan used those [-] computers to visit the website of Perfect Company, and found the perfect server through the website. Since there were no new game players registered, the perfect server had to open more ports to let the information After passing through, Xiao Yihan came to the service port of Yufeng in the classic telecom area [-], ready to invade.

Xiao Yihan is preparing to use ddos ​​distributed denial of service attack.At present, the common protocol in the world network is the tcp/ip protocol, and its protocol basis is the connection-oriented tcp three-way dialogue.

This is the process of the so-called three dialogues.

First, the user sends an access request to the server.

This is the first dialogue of the tcp/ip protocol, and the user requests a dialogue.

Then, the server confirms the user's identity, and after confirming that it can be trusted, he will return information to the user and agree to access.

This is the second dialogue of the tcp/ip protocol, and the server requires a dialogue.

After that, the user will complete the connection with the server.

This is the third dialogue of the tcp/ip protocol, and the user and the server complete the dialogue.

After the three steps are completed, the user is connected to the server, and the user can freely browse the content in the server.

The DDoS distributed denial of service attack is maliciously not talking during the third handshake.

If it is a human being, someone chatted with you in full swing just now, but now they are suddenly indifferent to your words. When encountering this situation, they may immediately yell at you, but the server will not, he will stand there and wait for you for a while, really waiting If you don't speak for a long time, he will turn around and leave, which will cause the server to lag.

For the server, it is not a big problem for a user to have an exception, causing a thread of the server to wait for 1 minute.But if there is a malicious attacker who manipulates many broiler computers to deliberately perform this behavior together, the server will consume a lot of resources in order to maintain a very large semi-connection list-hundreds of thousands of semi-connections. Connection, even simple saving and compiling will consume a lot of cpu time and memory, not to mention constantly retrying syn+ack on the ip in this list.

And this is a standard ddos ​​distributed denial of service attack.Now I see Xiao Yihan tapping his fingers on the keyboard, and the nearly a thousand broilers he captured, each of which sent such accesses to the perfect server at the same time thousands of times per second, it really only took a while, the perfect server There are tens of millions of information verifications on the display screen, and the perfect information verification is automatic verification, but such a huge amount of verifications, how can the perfect server handle it? At this time, players in the game have been disconnected, The game runs very laggy.At this time, Xiao Yihan forged his own IP address with the communication software Xunsu, began to invade the server, calculated the login account and password of the server, and thus obtained the advanced user management authority.

Then Xiao Yihan entered the database, easily found his registered game account, and modified his data based on what Zhang Shaogang and Xiao Yihan saw on the forum. After 3 minutes, Xiao Yihan exited the perfect server and wiped the future clean. net.Originally, he thought that this invasion would not be so easy, but because Perfect's technicians were sleeping, Xiao Yihan easily invaded Perfect's server and successfully modified the data.Xiao Yihan originally wanted to use poison to conquer the perfect server, but he didn't expect that the technician fell asleep, and Xiao Yihan easily invaded the server without leaving a single trace.

Just when Xiao Yihan wiped the road clean and had returned, the duty phone of Perfect Company rang suddenly. The technician picked up the phone with soft and waking eyes, and heard the customer service over there say: "It just so happened that many players called Come over and say that the game is disconnected now and the card is very bad, you can see if there is any problem with the server."

The technician took a look at the data flow monitoring software on several servers, and everything was normal.

Then he called back and said: "The server is fine, maybe there is something wrong with their own computer, just ask them to log out of the game and log in again."

At this time, those players exited the game according to the perfect statement, logged back in, and found that the game was running normally.

At this time, Xiao Yihan also logged into the game.

Knife for collection