(New book period, ask for flowers, ask for collection!) "The master is here, why do you judge it so much? Tang Xinyu stared at the traffic monitoring curve on the computer, frowned and asked.

"You look at the traffic curve, like this, 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, that is, there are a large number of computers, at the same time to access our server, otherwise, only by the previous spontaneous attacks of those script boys, it is impossible to have such an effect, what does this mean?" Gu Wolf said.

"We have been monitoring the major forums and chat rooms where domestic hackers gather, and no one has launched such an attack on our server at the same time, and again, you look at the firewall logs, all these service requests sent by computers are very regular, and many URLs are Class A addresses, you know, we do not have Class A addresses in China, and this can show that the guy who attacked us is abroad, obviously not, the reason for the emergence of Class A addresses, it is more likely that someone controls some foreign hosts with Class A addresses...... Gu Wolf analyzed in an orderly manner.

"So, I make a judgment that there are hackers who control a large number of computers and are sending us a tentative attack, and these computers, because they have been completely controlled by hackers, are at their mercy, so they have a very vivid name, called broiler!" Gu Wolf finally came to a conclusion, and did not forget to popularize hacking knowledge to Tang Xinyu.

"Broiler, this name is quite vivid?" Tang Xinyu said, and then saw that the soaring network traffic stopped at a height and no longer rose, so he was a little relieved, and then asked, "Didn't you say that masters generally don't make a move at this time, why is this master so anxious?" ”

"Hehe, I'm judging according to common sense, and there are some hackers who don't play cards according to common sense, this guy's attack should be just a temptation, or for some other purpose." Gu Wolf said.

As he spoke, the network traffic had dropped, and the firewall logs showed that a large number of invalid duplicate request addresses had been determined to be malicious attack sources and blocked.

…………

Like Xuanne's company, there are also some people in the headquarters of Tianlong Technology in Jiangzhou City, who have stayed up all night, Zhang Dalong and Lei Lianghang stood behind the white young Black Jack, watching a large amount of data in a software running on his computer keep scrolling.

"Blackjack controls 50,000 computers distributed around the world and simultaneously initiates service requests to the Genne server." When Lei Lianghang was paying attention to Black Jack's actions, he did not forget that there was also a Mr. Zhang who knew nothing about computers, so he took the initiative to introduce.

"It's amazing, Mr. Blackjack can control tens of thousands of computers, it should be able to paralyze the Genne server for a while, haha, let's hit 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 his shoulders to Zhang Dalong, turned his head again, and stared at the computer screen.

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

"Blackjack asked me just now, why are you laughing, do you look down on him, I explained to him, he said that the Xuanne 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 are not enough, so how much is needed, just let Mr. Blackjack continue to increase?" Zhang Dalong said in surprise.

At this time, Black Jack was just paying attention to the information fed back by the software on the computer, and he didn't need to do anything himself, so he turned his head again and had a conversation with Lei Lianghang.

"Blackjack said that he has a maximum of 100,000 computers that he can control, excluding some computers that are not online, the maximum number of computers he can mobilize now is less than 80,000, and if he wants to crash the Genne server, 100,000 computers may not be enough, so if he wants to use a denial of service attack to paralyze the Genne server, he can't do it for the time being." Lei Lianghang translated.

"Since 100,000 units are not enough, he only uses 50,000 computers to launch an attack on the Xuan Ne server, what does he want to do?" Zhang Dalong asked suspiciously.

Lei Lianghang talked to Blackjack for a few more words, and then said to Zhang Dalong: "Blackjack is using these 50,000 computers to test the Xuanne server, the purpose is to analyze the other party's defense strategy against denial of service attacks from the feedback information through this trial, and at the same time, he is also testing the possible vulnerabilities of the other party's server and firewall, and then using these vulnerabilities to take down the other party in one fell swoop." Lei Lianghang said.

"Oh, see, you help me translate to Mr. Blackjack, and wish him success and all the best." Zhang Dalong said with relief.

…………

Gu Wolf and Tang Xinyu observed for a while, and found that the network traffic dropped quickly, and the time had reached 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, and notify them as soon as there was any trouble, because the stakes were very important, so they didn't dare to leave easily, so they looked for a place to rest in the company's office.

The next day, after dawn, Gu Wolf and Tang Xinyu woke up and did not go to breakfast immediately, but returned to the network department first.

"Mr. Tang is good, Mr. Gu is good." Xiao Li was sitting in front of the computer and was napping, and woke up after hearing the movement, and quickly stood up and said hello to the two.

"Well, hard work." Gu Wolf walked up to Xiao Li, patted him on the shoulder and said a word of encouragement, and then asked, "Did you have anything else to do last night?" ”

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

"I'll see." Gu Wolf opened the firewall log, looked through it, and sure enough, as Xiao Li said, although after they left, there were still continuous attacks, but they were all routine such as scanning the open ports of the server, detecting server vulnerabilities by some means, etc., and there was no unusual phenomenon, after they left, the phenomenon of network traffic skyrocketing never appeared again.

Because Xiao Yuan originally designed the firewall under Windows, the server uses the Windows NT system, although the security and maturity of this system itself are far from the old server operating system UNIX, but the Xuan Ne Firewall is like a hard armor outside the operating system, helping the server to keep all attacks out.

Of course, this is not to say that the Xuanne Firewall does not have any vulnerabilities and is invulnerable, just as the best armor has seams, the Xuanne Firewall also has its weaknesses, as long as these weaknesses are found and successfully exploited, the server can be successfully hacked.

As a simple example, the Xuannese firewall has a strong resistance to distributed denial-of-service attacks, but there is also a limit to this resistance, as long as enough computers can be used to send service requests to the server at the same time, and the firewall will fall into a temporary abnormal state if the firewall's resistance limit is exceeded.

In fact, denial-of-service attack (DDOS) is a disguised crowd tactic, its principle is simple, as long as the number reaches a certain level, then this attack can almost be said to be unsolvable, any server, or firewall can not completely resist denial of service attack, the same can not be done by the Xuannei firewall, but compared with the ordinary firewall, the upper limit of the Xuannee firewall is much higher.

Of course, it is impossible for either Xiao Yuan or Gu Wolf not to take this into account, and in response to this, he also has his own way of dealing with this, although this method is a bit scoundrel, but it is absolutely effective.

Seeing that the server was temporarily fine, Gu Wolf and Tang Xinyu arranged for another person to replace Xiao Li, and then went out for breakfast.

After breakfast, back in the computer room again, Xiao Zhang, a staff member on duty at the computer, stood up and said, "Mr. Tang, Mr. Gu, come and see, someone has made a post on the forum against our firewall, and the number of hits is very high. ”