Liu Xiao wiped the sweat on his head and opened the door of the shopkeeper.

The shopkeeper was very unhappy and said: "You looked at the car, scared yourself out of a cold sweat, not to mention, but also scared me so much, can you afford to pay for the car being damaged?"

Liu Xiao went in and sat down, nodding again and again, "I must be careful in the future, I have seen such a windy car before, but I have never sat on it, and I am a little out of shape!" Liu Xiao simply followed Da Fei's words and said, the soil buns are the soil buns.

The shopkeeper glanced at Liu Xiao with disdain, put on his sunglasses, then lowered the window, shouted the name of the place to Da Fei, and drove first.

Liu Xiao sat aside, continuing to think about the question he had just asked, if his guess was true, the so-called "elites" in this soft alliance were the core strength of the ufeifan group, then what should he do?

The shopkeeper seems to want to show off his beautiful car and driving skills in Liu Xiao's dirt bun, as long as the road conditions are slightly better, he will keep accelerating and overtaking, and he will race all the way. He couldn't imagine that Liu Xiao was not only envious, but also sighed in his heart, a person like Boss Xiong, the business is so big, how thick the bottom is, but even so, he is not willing to buy such an expensive car, and a small technician in the soft alliance, as soon as he goes out, there is a car worth millions under his buttocks, these guys use their own technology to forcibly seize and scrape other money into their pockets, so they are not distressed at all when they spend it.

And the reason why Liu Xiao is resentful is because of this, if the people of the soft alliance rely on their own skills and make money through legitimate means, then even if you all fly helicopters, I, Liu Xiao, will only sincerely bless you, because this is what you deserve. And if you come to grab money like Wu Yue Overlord, QQ Theft Group, and Shenqi Pig, then I, Liu Xiao, will definitely not accept it, it is not something you deserve, even if you have already eaten it, I Liu Xiao will let you spit it out as it is.

Thinking of this, Liu Xiao's mind was decided, it seemed that he had to continue to stay in the Soft League, looking for an opportunity to strip him off the angelic coats of these vampire locusts.

The shopkeeper's car finally stopped in front of a crimson luxury office building, "Yes, that's it, let's wait for a while!"

Liu Xiao got out of the car and looked left and right, there was some surprise, here you can actually see the Tianjing Building standing not far away, think about it carefully, Liu Xiao remembered that when he was in NLB, the place where he was standing at the moment seemed to be a construction site, but he didn't expect that after a month, it would become a five-story luxury office building.

Thinking of NLB, I don't know how Niu Pengen is now, Boss Niu lied to the police for his own sake, although the matter is now over, but no matter what he says, he should go to see Boss Niu, otherwise it does make Boss Niu a little chilling.

"What are you looking at?" the shopkeeper got out of the car, "Haven't you seen such a tall building before!" Hmm, this is Tianjing Building, the most senior office building in Haicheng, and when the performance of our soft alliance is improved a little more, we will also move here!"

Liu Xiao shook his head and smiled bitterly, he had been in it for more than a month, and he really didn't think there was anything good in it.

The shopkeeper raised his hand to look at the time, and muttered: "What's the matter with this Da Fei, it's just a donkey cart, it should have arrived, okay, let's go in first!" After speaking, the shopkeeper walked towards the office building behind him.

Liu Xiao looked left and right, and indeed there was no shadow of the big flying car, shook his head, turned around and quickly followed the shopkeeper, "Three...... Third brother, what kind of work is it today?"

"This company has just completed the transformation of the plant and the upgrade of the enterprise network, today was supposed to be their new business conference and move back to the new factory on a festive day, who knows that the company's network is paralyzed, this is not, call us for help, no matter how specific the situation I am not emotional, let's talk about it after entering!"

Liu Xiao was also helpless, and walked in behind the shopkeeper.

As soon as I entered the door, the luxuriously decorated hall was in great contrast with the sad faces in the hall, and when I saw the two of them coming in, the reception MM at the front desk stepped forward, "Hello, are you also here to attend the press conference?"

The shopkeeper put away his sunglasses, "No, we are from the soft alliance, and your company's network maintenance department called us over." ”

"Are you from the soft alliance?" As soon as the shopkeeper's voice fell, a middle-aged man in a suit and leather shoes came out next to him, and came over and grabbed the shopkeeper's hand, "But I'm looking forward to you!"

"You are ......" The shopkeeper was a little overwhelmed by the other party's enthusiasm.

"The contemptible surname Fang is the boss here. The man was still very excited, "You guys are here, and the life and death of our company depends on the two of you!"

"Don't worry!" The shopkeeper frowned, "It's okay to make your words clear!"

"That's the case, our company's network is completely broken, and the people in the network department check it and say that it is linked, but no one can access the Internet, and these hundreds of machines in the enterprise can't find each other. That party always sighed, "If it's just like this, then it's okay, we just run more errands, and it won't delay the company's office and business contact, but the plant behind this is just completed by us, and the new fully automatic production line, everything is operated by the computer, and the assembly line is stopped." There is a list in the factory that is about to expire, and the production line on the side of the old factory has just been dismantled, and it can't be installed back if you want to. ”

As soon as Liu Xiao heard this, a word popped up in his mind: ARP attacks, and most of the things that can cause this effect are caused by ARP attacks. This attack is also somewhat similar to that of a spy joint, and more like a postman handing out newspapers. The postman has a large number of newspapers to deliver every day, he knows the name of the person who ordered the newspaper and the detailed address, the name is like the IP address of the computer, and the detailed address is the MAC address of the computer, the postman writes these down in his workbook, and then sends the newspaper every day according to the address behind the name, if the person who orders the newspaper moves, he also has to modify the record in his workbook to ensure that it is delivered to the new address. If a user unsubscribes from the newspaper, he will have to delete the person's name and address from the workbook.

Generally speaking, there is nothing wrong with this, but it is not entirely error-free, if someone sends a lot of requests to the post office to order a newspaper, and the names and addresses provided are all false, and the next day, the post office sends all the postmen to distribute the newspapers, and as a result, the postmen wander the streets and alleys, tossing back and forth to find the addresses of these users, then the distribution of newspapers in the city is paralyzed.

Now, the network of this enterprise is probably filled with too many "postmen" who are confused, and they are completely lost, which leads to the complete interruption of the normal communication of the enterprise.

What's more, they will also take the opportunity to steal newspapers that do not belong to them, and the postman will take the newspaper and ask around: "Who knows Zhang San, where does his family live?", at this time Li Si jumped out, "I know, his family lives at No. XX Road!", the postman was overjoyed, and after finishing it, he sent this newspaper to this address, and added Zhang San's name and this address to his workbook, as long as it was Zhang San's things in the future, he would send it to this address.

And this address is not Zhang San's at all, but Li Si's, Li Si read Zhang San's newspaper before forwarding it to Zhang San. If it was just a newspaper, what if the postman delivered Zhang San's confidential letters? In addition to stealing this secret, Li Si also had the possibility of stealing Zhang San's letters, and this would be more harmful.

In fact, the same is true for communication between computers, if computer A wants to send a message to computer B, he must first know the IP address of computer B, that is, the name of the person who ordered the newspaper, and then find the MAC address corresponding to this IP address in his record list, that is, the detailed address of the newspaper subscriber, and after finding it, computer A can send the message to the past. When he can't find the MAC address of computer B, he will send a broadcast from the whole network to ask for the specific address of computer B, so that someone with a heart can find the opportunity.

To solve the problem of this ARP attack is also very simple, after all, the enterprise is not as large as the post office, only hundreds of machines, as long as the IP address of each machine is fixed, and then bound to his MAC address, and then establish a mapping table, these correspondence is saved, just like the workbook in the hands of the postman, but to ensure that the workbook is absolutely static, the records in it can not be changed, so that the message will not be transmitted incorrectly, even if a new machine is added in the future, as long as a new IP address is set to the new machine, and then correspond to its MAC address and add it to this mapping table。 The second is to find the source of the ARP attack and eliminate it.

However, the shopkeeper seemed to be more cautious, just bowing slightly, "Let's investigate first, first of all, to figure out the cause of this situation, as for when it can be recovered, we have to find the cause to be determined." But don't worry too much, with the strength of our soft alliance, to solve this kind of problem, it is still easy to catch. ”

"That's good, that's good!" Mr. Fang's face finally looked better, but he pulled the shopkeeper aside and said in a low voice: "In addition, I have one more thing to ask you." ”

"You say!" said the shopkeeper smiled.

"This ...... This, you are a master in this industry, you are surprised, you can analyze it, could this be someone deliberately tidying up our company? I heard that those hackers are very powerful and omnipotent, could they be here for our company's trade secrets?"

"Oh...... The shopkeeper pondered for a moment, "We can find the cause of the network paralysis, and we can also restore your network communication here in the shortest possible time, but as for what you said......" The shopkeeper paused again, looking unfathomable, "I can't rule out this possibility, but whether it is a hacker or not, and what is the purpose of the intrusion, then we have to do a detailed inspection, this process is very troublesome and time-consuming......"

Mr. Fang looked left and right, and went up with his ear, "We are not afraid of trouble, but this problem must be clarified! ”

The shopkeeper laughed "hehe", "The matter of the part, the matter of the part." Otherwise, our people will restore the normal operation of your network in the shortest possible time, so that your workshop can start work without delaying your construction period. What do you think of the matter you are talking about, I will be in charge of investigating?"

"It's worthy of being an expert, this is the best, this is the best, then it will trouble you!" As soon as Mr. Fang heard this, he had a bottom in his heart, thinking that this soft alliance was really worthy of its reputation, as soon as he heard this, he knew that the person who came must be a master, and he had dealt with a lot of such things and had experience.

"Then let's start doing it!" The shopkeeper laughed a few more times, turned to Liu Xiao and said, "Liu Xiao, you go to the technician of their network department to verify and find the cause of the problem!"

"Okay!" Liu Xiao responded, and someone on the side took him to the network department.

The shopkeeper looked back at the window and couldn't help but curse in a low voice: "Damn!

PS: The war between geniuses and geniuses in "Hackers".