In contrast, SoftAlliance Technology is much shabby, the office space is rented, Liu Xiao called them several times in a row before he touched the place, and by the time he arrived, he had already passed the interview point.

The reception at the front desk saw that Liu Xiao was sweating profusely, and it was not good to send him away like this, so he took him into the office area.

Liu Xiao was taken aback by the office atmosphere of the soft alliance, it was simply a group of rangers, some wearing slippers and strolling around the office area, some sitting in front of the computer eating, some sleeping on the table, and even playing games.

The receptionist pushed open the innermost door and shouted, "There's another interview here!"

Liu Xiao looked inside, this is a relatively small office area, there are more than a dozen people sitting in it, each guarding a computer, hearing the words of MM at the front desk, one person raised his head, "Aren't all interviews over?"

The MM at the front desk smiled, "I can't find a place to be late!"

The man frowned, looked around, and shouted, "Which of you is free, go for an interview." After shouting for a long time, no one answered, so the man had to stand up and scolded: "You slackers, interviewing someone can kill you." ”

Others just laughed and didn't talk.

The man beckoned Liu Xiao to come in and pointed to a computer in the corner: "This is a newly set up WEB server, and we haven't installed the hardware firewall of our soft alliance yet, you go and do it." If you do a good job, call me, I will carry out a SYN flood attack on him in a while, and require, first, not to crash, and second, not to affect the normal user's access to the web page. With that, the man sat back in his place and went about his work.

Liu Xiao was a little depressed, he hadn't had time to take out his resume, and seeing that no one was paying attention to him, he had to walk to the server, drag a chair and sit down, and began to make some adjustments to the settings on the server.

SYN flood attack is actually one of the most common attack methods, but because of its simple operation and high success rate, it has still become the preferred method for some people to attack maliciously. The principle of its attack is simple, it is to exploit the BUG in the communication protocol. We usually visit the website, as long as you enter the URL, as for how the URL is linked to the website server, and how the website server transmits the information we need, we don't need to worry about it, these are the work of the communication protocol.

In fact, this process is very similar to the spy connection in the movie, first, agent A sends the code "Heavenly King covers the tiger" to agent B, asking for the connection; after agent B receives the code, he sends the second half of the code to agent A "Pagoda Town River Demon"; agent A sees that the code is correct and is his own person, so he sends a message to agent B that "it can be connected", and then the two agents successfully meet and begin to exchange information.

When we visit a website, we are Agent A, and the server of the website is Agent B, but the server plays the role of Agent B, who is too stupid. If Agent A shouts "Heavenly King Covers the Tiger" and then suddenly runs away, Agent B can't wait for the other party's reply, and will think that the other party may not have heard his code, so he will stand there and shout over and over again, "Pagoda Town River Demon...... The Demon ...... River Demon ...... Demon ......" until he called himself a "Wangfu Stone".

However, the web server cannot face only one user, he has to face a lot of spy A who needs to connect. The most terrible thing is that this weakness of agent B was known by the enemy, and the enemy hired a large group of pseudo-agent A, who shouted "Heavenly King and Tiger Tiger" to agent B one after another, disappeared after shouting, and shouted again in a different place after a while, poor agent B, he either went down in the end, or was exhausted to death.

And what Liu Xiao has to do now is to save this stupid agent B, so that he can fight for the maximum number of agent A on the premise of not being tired to death and not going down, so as to ensure the normal operation of the intelligence station at full capacity, and in addition, to prevent him from being deceived by those pseudo agent A.

It is not difficult to do this, Liu Xiao set a limit on the number of agents A who can receive them at the same time according to the configuration of the server, once this number is exceeded, even if agent A shouts ten times "Heavenly King Covers the Tiger", the server will pretend not to hear, so there is no possibility of downtime.

However, the number of pseudo-agent A hired by the enemy may exceed the number limit of the server, once all the reception positions of the server are occupied by those pseudo-agent A, the real agent A will not be able to connect with agent B, even if the server is not down, in fact, it is no different from downtime, and its own people can't connect to it, so its role is not played at all.

At this time, it is necessary to limit the number of times Agent B shouts "Pagoda Town River Demon", and he can't just shout so indefinitely, shouting once or twice, and if he can't see the other party's reply, he will kick the other party away from his position, and let Agent A in line behind him come in to speed up the rotation.

Therefore, how to reasonably set these two values is very important, Liu Xiao set the values very well, and then engaged in an IP screening strategy to ensure that they are not deceived by fake IPs as much as possible. In fact, if the number of fake IPs forged by the other party exceeds the limit of the server's tolerance by several times, or even dozens of times, then this soft strategy may not play a big role, but the people of the soft alliance limit the use of hardware firewalls, and this is what Liu Xiao can do, but he still tried his best to add some of his own unique settings.

"Okay!" Liu Xiao stood up after confirming that it was correct, and shouted at the person who interviewed him, "You can start!"

"Shopkeeper!, you're coming!" the man didn't raise his head, and shouted directly.

Liu Xiao was taken aback, he was very familiar with the name of the shopkeeper, a well-known hacker master on the Internet, who often publishes some articles on hackers' introductory knowledge, and has many fans. The debut of the shop junior was a year or two later than the evil sword and others, and many hackers after him only stepped into the door of hackers under the guidance of his articles.

I saw a very thin man slowly stand up from his chair, "Got it!", and then walked out of the office and went to the large office area outside, probably arranged for people.

"It turns out that the shopkeeper is like this!" Liu Xiao always thought that the shopkeeper was probably a little related to the previous shopkeeper, with a flamboyant tongue and a smile on his face, but now that he looks at it, it is not like that at all, the shopkeeper is still quite cold.

The shopkeeper didn't come back for a long time after he went out, Liu Xiao had to look at the people in the house boredly, guessing which legendary master these people were, and many of the famous masters on the Internet were all caught under Long Izumo's command. Liu Xiao understood a little at this time why the people of the soft alliance didn't look at their resumes, because most of these hacker masters were wild monks who had become monks halfway, and some of them were even more miserable than Liu Xiaolai, not to mention a famous school, they might not even have studied in an ordinary university, and they were completely self-taught by virtue of interest and talent. However, Liu Xiao appreciates the concept of "employing people only by talent" of the soft alliance.

After another ten minutes or so, the shopkeeper walked in, entered the door and went straight to the server, still muttering: "Have you ever touched this server? The tester has increased the number of attacks twice in a row, not only did it not crash, but the web page access was normal!"

The shopkeeper's words immediately attracted everyone's attention.

Dian Xiaosan is a master in the road, and when he came up, he went straight to the settings changed by Liu Xiao, and found that there was nothing unusual about the value setting, but it was very close to the best value that he usually tested, and the shop Xiaosan opened the system's protection strategy, and found that there was an additional IP screening strategy, and opened it to look at the settings, and the shop Xiaosan was a little surprised, "It's very interesting, and the IP segments that hackers like to fake that can't exist are basically filtered." ”

The shopkeeper turned around and gave Liu Xiao a thumbs up, "You kid, it seems that you have studied a lot." It's just that the shopkeeper's expression is still so cold.

Everyone looked at the shopkeeper and said it mysteriously, and they all ran over to take a look, and they were all amazed after reading it, especially the person who gave Liu Xiao the interview question before, and patted Liu Xiao on the shoulder twice, "Boy, not bad!"

"I want this kid!" the voice came from the far corner.

Liu Xiaoqi looked over, a man with long hair in a shawl and a very powerful appearance was sitting there, his eyes were even fixed on the computer in front of him, and this was the only person in the office who did not come to see the excitement.

The interviewer was very happy and said, "What are you doing stupidly, didn't listen to our boss, you have been admitted to the soft alliance! Hurry up and talk about your salary requirements, and the contract will also be signed, save trouble, and you can come to work tomorrow." ”

"Not tomorrow!" Liu Xiao shouted, "I'm a fresh graduate, and I can't come to work until the thesis defense is over!"

"Haven't graduated yet?" the people in the office looked over.

"It's almost coming, it's not going to be two months. Liu Xiao hurriedly replied.

The interviewer looked at the innermost boss, and when he saw that the boss didn't react, he said: "Okay, okay, look at your verbosity, sign the contract first, and report after the thesis defense." After speaking, he paused, "You haven't said your salary yet!"

I was angry in Yinfeng just now, so Liu Xiao was unceremonious, and said: "6000, I want to increase my salary every six months!"

Everyone looked at them again in amazement, thinking that this kid really dared to open his mouth.

The boss in the corner still didn't react.

"Yes, 6000 is 6000!" The interviewer walked to the door and shouted outside: "Ministry of Manpower, take a copy of our contract!"

Liu Xiao hurriedly took out a contract from his schoolbag, "Sign this! What Liu Xiao has in his hand is the employment contract issued by the school.

The man had probably seen such a contract before, frowned, rummaged through the table, found a pen, and then walked to the corner with Liu Xiao's contract, and the boss did not shirk, and signed his name on the contract very happily.

The man took the contract and the pen and walked back, beckoning to Liu Xiao, "Come on, come on, hurry up and sign your name, and the people from the Ministry of Human Resources will come in a while, just take a copy and keep it." ”

Liu Xiao was overjoyed, went up to brush a few strokes, signed his name, and waited for the people from the Ministry of Human Resources to bring the formal employment contract, Liu Xiao carefully filled it in, especially the salary column, as well as the date of registration, he carefully checked it several times, and then signed his name.

"It's really grinding!" The interviewer put away the contract, walked to the corner and asked the boss to sign it again, and then took out a copy and handed it to Liu Xiao, "Qi Huo! You go back and hurry up to finish your dissertation defense, and then report here." After speaking, he picked up a business card from his desk, "You have my business card, if you have any problems or difficulties, call me, and the company will try its best to solve it if it can help you." ”

Liu Xiao carefully put it away, and then waved his hand at the people in the office, "That... Then I'll go back first, goodbye!"

"Let's go, let's go!" the man waved his hand and returned to his desk.

Walking out of the door of the soft alliance, Liu Xiao was extremely happy, and the application was successful! The soft alliance gave him a very good feeling, an open, relaxed, and free office atmosphere, an eclectic concept of employing people, and most importantly, the soft alliance is really a paradise for hacker masters as the outside world says, and the office just interviewed is estimated to have gathered half of the security experts in China. As for who the boss sitting in the corner is, Liu Xiao really can't think of it for a while, but looking at his style, he knows that he is definitely not a general.

After more than ten hours on the train, Liu Xiao returned to Fengming City again, and his classmates and friends all knew that he had signed a successful contract, and shouted for him to have a treat, for several days, Liu Xiao was busy inviting him to invite him, until Zhang Xiaohua called him, he remembered the bet with Zhang Chunsheng, and apologized, he did not forget to invite Zhang Xiaohua to dinner.