Rebirth of the big era of online games

Chapter 97 Don't Do Porcelain Work, It's Fragile
"Is the Internet cafe disconnected?"

Seeing Liu Qiang sweating profusely, Fang Jie couldn't help but stunned for a moment, and checked his game server. The network is very normal, and there is no problem.

That means it's not a regional telecom failure, but just a problem with the network settings of the Internet cafe itself.

Of course, Liu Qiang said the same thing, but Fang Jie didn't believe what other laymen said, and it was better to confirm some issues himself.

"What exactly is the situation?"

As he walked out, Fang Jie asked, "Is there any abnormality or system prompt?"

Liu Qiang said: "It is said that the IP address conflicts with other systems on the network..."

"Oh~"

As soon as Fang Jie heard it, he knew what the problem was, and he was a little puzzled: "Brother Qiang, didn't you hire a network administrator? Wouldn't it be enough to change the local IP of the LAN?"

"Hey! He didn't get it right after a long time!"

Liu Qiang looked depressed and whispered: "From the technical school, how strong do you expect him to be? I see you messing around with servers all day, so you have to come out!"

"Well, I'll take a look first." Fang Jie nodded noncommittally.

At this time, it was more than 8 o'clock in the evening, during the peak period of Internet access. Due to the disconnection of the Internet, there was chaos in the Internet cafe.

Some people clamored for their money back and left, some wanted to leave with a bit of luck, and some people scratched their heads and scratched their ears in a hurry, as if they had delayed something important.

Seeing Liu Qiang and Fang Jie coming out of the computer room, seven or eight people gathered around at once, inquiring about the situation, and some people asked to get off the plane to check out.

"Okay, come to the cashier if you want to refund the bill..."

Liu Qiang's head suddenly became big, and his business will be greatly affected tonight.

Fang Jie went straight to the host computer in front of the Internet cashier of the Internet cafe and sat down, looking at the icon in the lower right corner of the desktop.

The above is a very familiar logo, a triangle yellow exclamation mark + Windows system error, the prompt is: The IP address conflicts with other systems on the network.

"interesting……"

Seeing this prompt, Fang Jie couldn't help twitching his lips, and immediately realized that this was not a problem with the network settings, but someone was maliciously making trouble.

At this moment, there is no so-called network management system on the computers of Internet cafes, and most system function settings are not restricted or locked. The computer system is almost an undefended existence. It is easy to break through these restrictions with a little understanding of the computer, so I gave some ulterior motives. Guys can take the opportunity.

Things like LAN IP conflicts were often encountered by Fang Jie during his previous life when he was studying at university and when he was renting off-campus.

Strictly speaking, this is not an IP conflict, but an IP attack. The nature is hacking, but it belongs to the lowest level of hacking, with almost no technical content.

After a second thought, Fang Jie said to Liu Qiang, "Brother Qiang, don't settle the bill for them, go and lock the door of the Internet cafe!"

"Ang?" Liu Qiang said stunned: "Why?"

"Someone is deliberately making trouble!"

Fang Jie smiled and looked at the people in front of the bar who asked for refunds: "Some of you must have manipulated the computer! I advise you to take the initiative to admit it, apologize, and compensate for the loss. If so, call the police."

Upon hearing this, the expressions of everyone present changed slightly.

Liu Qiang's face turned cold: "You all go back to your seats first! Don't worry, a lot of the money that should be refunded will be refunded to you! If anyone dares to go out this door now, don't blame me for being rude!"

These days, most people who open Internet cafes have transformed from computer rooms, and those who open computer rooms have some background in the local area. They even used to hang out outside. Liu Qiang's brother Liu Jian was on the road.

Just from the names "Qiang" and "Jian" of the two brothers, we know that they are definitely not good birds.

Well, in fact, this is just a joke. If Liu Qiang is the elder brother, then there will be a problem. If it is the younger brother, the name is actually very positive.

Be strong!
Besides, this is the Shuanglu District. They are all employees of state-owned enterprises and their children. Who doesn't know who? Even the monk can't escape the temple if he runs away.

So after Liu Qiang finished speaking, everyone honestly returned to the computer on the chartered plane and sat down, waiting for the truth to be revealed.

At this moment, the suspect didn't know whether it was tough or just fluke, or was frightened and didn't come out to confess and be lenient.

Liu Qiang was not at ease, he really went to lock the door of the Internet cafe, this time he really wanted to catch a turtle in the urn.

Back in front of Fang Jie, Liu Qiang patted his shoulder and said, "It's up to you now, find the person for me!"

Fang Jie smiled: "Let's restore the network first."

Having said that, open "Run" on the computer, enter the command CMD, and enter the command prompt dialog box, which is the MS-DOS operating system.

Enter the "arp -a" address resolution protocol command in the DOS operating system, and you can see all the Internet addresses of the computer and the corresponding physical addresses of the MAC network card.

Of course, you can also enter the network settings to view the corresponding network address, but the method he uses is more advanced and convenient.

Find the dynamic IP address, displayed as: 192.168.0.1.

对应的MAC地址显示为：00-68-A8-B0-C7-20。

The so-called MAC address, that is, the "adapter address", is the unique ID card of a host in the network, which is globally unique and cannot be changed or conflicted...

Of course, these words can only deceive ordinary people, and the specifics are not mentioned.

The trial period of some paid software is bound to this MAC address. Once the trial period expires, unless you pay the fee or modify the MAC address, you cannot continue to use it.

直接在DOS操作系统里输入“ARP –S 192.168.0.1 00-68-A8-B0-C7-20”，然后回车。

Then enter "ipconfig" and press Enter to bind the LAN IP address and MAC address.

In this way, IP collision attacks cannot be carried out.

To confirm this, ping the network IP with the "ping" command.

Get it, less than 1 minute, the network is back to normal!
The mere IP conflict attack is too trivial. If it is Fang Jie, it will directly lead to a MAC address conflict. It is estimated that even if the technicians from Computer City are recruited these days, they may not be able to find and solve this more subtle IP conflict attack.

By the way, the method of modifying the MAC hardware address can also be used to surf the Internet at home, directly kick the household who paid the Internet fee offline, and then use other people's Internet to surf the Internet for free...

Forget it, I won't go into details, I'm afraid I'll spoil the children, and if they do this in future generations, the network operator will definitely find out, and at that time, they will be warned at light level, and at worst... um.

After restoring the Internet cafe network, Fang Jie still has another task to find the suspect.

This is also simple.

Enter the "nbtstat -a 192.168.0.1" command directly in the DOS operating system.
nbtstat is used to view statistics of NetBIOS services running on top of the TCP/IP protocol, and can view a list of NetBIOS names on the local remote computer.
In other words, you can find the attacker's physical MAC address and workgroup occupying the IP address "192.168.0.1".

其物理MAC地址当即显示了出来：00-30-18-A6-C6-B0。

As for the rest, it's even simpler. Go directly to each computer and look at the network card address, and you will know that the machine is acting as a demon.

Soon, Fang Jie led Liu Qiang to find the same adapter address on machine 4.

Raising his chin toward the panic-stricken brother sitting on plane 4, Fang Jie said to Liu Qiang, "It's just him, I'm busy when I go back, how to deal with it is up to you."

After saying that, he returned to his computer room, ignoring the horrified and awe-stricken opponent.

Citi country is about to open the market soon, making money is the most important thing, how can you stay here and eat melons.

"Snapped!"

As soon as he entered the computer room, he heard a loud slap in the face from behind, followed by a series of punches and kicks, Fang Jie couldn't help shaking his head and sighing.

"Without that diamond, don't do porcelain work, it's fragile..."

　"Fifth Personality" tells us: the original "peek-a-boo" game in childhood can be called "asymmetrical confrontation game" such a tall name...

　　
　
(End of this chapter)