Reborn Ace Hack

(New book issue, please give me flowers and collect it!) "Here comes the expert, why do you think so?" Tang Xinyu frowned and asked, staring at the traffic monitoring curve on the computer.

"Look at the traffic curve. The traffic rises so high in an instant. In just a few seconds, the server receives tens of thousands of service requests. There is only one possibility, and that is that there are a large number of computers running at the same time.

Access our server, otherwise, it is impossible to have such an effect just by relying on the previous spontaneous attacks by script kiddies, what does this mean?" Gu Lang said.

"We have been monitoring major forums and chat rooms where domestic hackers gather, and no one has launched such activities to attack our servers at the same time. Furthermore, if you look at the firewall logs, the service requests issued by all these computers are very regular.

And many addresses are Class A addresses.

, you must know that we do not have Class A addresses in China, and does this mean that the guys who attacked us are abroad? Obviously not, the reason why Class A addresses appear is more likely to be that someone controls some Class A addresses abroad.

The host..." Gu Lang analyzed methodically.

"So, I concluded that hackers have controlled a large number of computers and are launching exploratory attacks on us. Because these computers have been completely controlled by hackers and are at their mercy, they have a very vivid name, broiler!"

Gu Lang finally came to a conclusion and did not forget to popularize hacker knowledge to Tang Xinyu.

"Broiler, this name is quite vivid?" Tang Xinyu said, and then saw that the soaring network traffic stopped at a high level and stopped rising. He felt relieved, and then asked, "Didn't you say that masters generally don't know how to do it?"

Do you want to take action at this time? Why is this master so impatient?"

"Haha, I judged based on common sense. There are also some hackers who don't follow common sense. This guy's attack should be just a test, or for some other purpose." Gu Lang said.

While we were talking, the network traffic had dropped, and the firewall logs showed that a large number of invalid repeated request addresses were determined to be the source of malicious attacks and were blocked.

…………

Like Xuannie Company, there were also some people staying up all night at Tianlong Technology Headquarters in Jiangzhou City. Zhang Dalong and Lei Lianghang stood behind the white young man Black Jack, watching him write a large number of files in a software running on his computer.

The data keeps scrolling.

"Black Jack controlled 50,000 computers distributed around the world to simultaneously initiate service requests to the Xuannie server." While Lei Lianghang was paying attention to Black Jack's actions, he did not forget that there was also Mr. Zhang beside him who knew little about computers.

, so he took the initiative to introduce it.

"That's awesome. Mr. Black Jack can control tens of thousands of computers. He should be able to paralyze the Xuan Nie server for a while. Haha, let's attack their arrogance first." Zhang Dalong laughed.

Black Jack listened to the conversation between Lei Lianghang and Zhang Dalong, turned his head and muttered a few words to Lei Lianghang, then shrugged to Zhang Dalong, turned back and stared at the computer screen.

"What were you talking about just now?" Zhang Dalong asked.

"Black Jack asked me just now, why are you laughing? Are you looking down on him? I explained to him. He said that Xuannie Firewall has a strong ability to defend against DDoS. If you want to paralyze the other party, tens of thousands of computers may not be enough.

"Lei Lianghang explained.

"Tens of thousands is not enough, so how much is needed? Just let Mr. Blackjack continue to increase it?" Zhang Dalong said in surprise.

At this time, Black Jack was only paying attention to the information fed back by the software on the computer. He did not need to do anything himself, so he turned his head again and had a few words with Lei Lianghang.

"Black Jack said that he can control up to 100,000 computers in his hand. Excluding some computers that are not online, the maximum number of computers he can mobilize now is less than 80,000. If he wants to crash the Xuan Nie server, 100,000 will be required.

I'm afraid there aren't enough computers, so if he wants to use a denial of service attack to paralyze the Xuannie server, he can't do it for the time being." Lei Lianghang translated.

"Since 100,000 computers are not enough, he only used 50,000 computers to attack the Xuannie server. What exactly did he want to do?" Zhang Dalong asked in confusion.

Lei Lianghang chatted with Black Jack for a few more words, and then said to Zhang Dalong: "Black Jack is using these 50,000 computers to test the Xuannie server. The purpose is to pass this test and from the feedback information,

Analyze the other party's defense strategy against denial-of-service attacks, and at the same time test the possible vulnerabilities in the other party's server and firewall, and then use these vulnerabilities to defeat the other party in one fell swoop," Lei Lianghang said.

"Oh, I understand. Please help me translate it to Mr. Black Jack. I wish him immediate success and everything goes well." Zhang Dalong said with relief.

…………

Gu Lang and Tang Xinyu observed for a while more and found that the network traffic dropped quickly. It was already half past one, so they called over Xiao Li, a newly recruited employee on duty, and told him to keep an eye on the computer.

Notify them immediately if there is any trouble. Because the matter is so important, they don't dare to leave easily, so they find a place to rest in the company office.

The next day, after dawn, Gu Lang and Tang Xinyu woke up. They did not go to have breakfast immediately, but returned to Luobu first.

"Hello, Mr. Tang, hello, Mr. Gu." Xiao Li was napping while sitting in front of the computer. He woke up when he heard the noise and quickly stood up to say hello to the two of them.

"Well, thank you for your hard work." Gu Lang walked up to Xiao Li, patted his shoulder and encouraged him, and then asked, "Did you do anything else last night?"

"No, after you left, the network traffic has been very low, everything is normal." Xiao Li said.

"Let me take a look." Gu Lang opened the firewall log and looked through it. Sure enough, as Xiao Li said, although there were still constant attacks after they left, they were all routine ones such as scanning the server's open ports and passing through

Some means were used to detect server vulnerabilities, etc., but nothing unusual happened. After they left, the surge in network traffic never happened again.

Because Xiao Yuan was originally in the system, although the security and maturity of the system itself are far from the old server operating system Unix, the Xuannie firewall is like a hard armor covering the outside of the operating system, helping the server to

All attacks are blocked.

Of course, this does not mean that the Xuannie Firewall has no loopholes and is impeccable. Just like even the best armor has seams, the Xuannie Firewall also has its weaknesses. As long as these weaknesses are discovered and successfully exploited, a successful invasion can be achieved.

server.

To give a simple example, Xuannie Firewall has strong resistance to distributed denial-of-service attacks, but this resistance also has an upper limit. As long as enough computers can be used to initiate service requests to the server at the same time, the number of service requests exceeded by the firewall

If the upper limit of resistance is exceeded, the firewall will fall into a temporary abnormal state.

In fact, denial of service attack (DDoS) is a disguised form of human wave tactic. Its principle is simple. As long as the number reaches a certain level, this kind of attack is almost unsolvable. Any server or firewall can do it.

Xuannie Firewall cannot completely resist denial-of-service attacks, but compared with ordinary firewalls, Xuannie Firewall's upper limit is much higher.

Of course, both Xiao Yuan and Gu Lang cannot fail to take this into consideration, and they also have their own methods of dealing with this. Although this method is a bit rogue, it is absolutely effective.

Seeing that the server was okay for the time being, Gu Lang and Tang Xinyu arranged for another person to replace Xiao Li, and then went out to have breakfast.

After breakfast, I returned to the computer room again. Xiao Zhang, the clerk who was on duty next to the computer, stood up and said, "Mr. Tang, Mr. Gu, come and take a look. Someone posted a post on the forum targeting our firewall. The number of clicks

Very high.”