C’est quoi un serveur DNS et quel en est son rôle ?
Nous allons aborder ici un serveur dont le rôle est essentiel dans Internet, je veux parler bien évidemment du serveur DNS. Vous verrez qu’il est utilisé partout sans forcément que vous vous en rendiez compte.Comme d’habitude pas de termes trop compliqués, je vais vous donner une définition du DNS expliquée de façon simple et répondre aux questions : « C’est quoi un serveur DNS et quel est son rôle ? ». Et pour terminer, nous aborderons également le lien avec le domaine.
Définition et rôle du DNS
Tout d’abord : DNS veut dire « Domain Name System » ou système de nom de domaine. Je vais tout d’abord vous expliquer le fonctionnement, puis nous aborderons la notion de nom de domaine (ou de sous-domaine).
Pour vous expliquer, le rôle et le fonctionnement d’un serveur DNS, je vais reprendre l’exemple du téléphone.
Vous souhaitez appeler quelqu’un dont vous ne connaissez pas le n° de téléphone ?
Que faites-vous ? ….
…. vous utilisez un annuaire !
Et bien voila, un serveur DNS est un annuaire pour ordinateur. Lorsque vous voulez accéder à un ordinateur dans le réseau, votre ordinateur va interroger le serveur DNS pour récupérer l’adresse de l’ordinateur que vous voulez joindre. Une fois, que votre ordinateur aura récupéré l’adresse du destinataire, il pourra le joindre directement avec son adresse IP.
Le serveur DNS va permettre de faire la relation entre nom d’ordinateur et adresse IP. (ramené au téléphone, on obtient : nom de l’abonné et n°).
Vous allez me dire :
» mais je ne cherche jamais à joindre un ordinateur dans le réseau ! «
A quoi, je vais vous répondre :
» bien sur que si ! «
» Actuellement vous lisez ces lignes qui ne sont stockés pas sur votre ordinateur, donc votre ordinateur s’est connecté à un serveur pour récupérer les pages qui sont affichées sur votre écran. «
Exemple
Reprenons en modèle ce que vous avez fait pour arriver sur cette page, et regardons comment le serveur DNS est intervenu sans que vous le sachiez.
Vous avez lancé votre navigateur Internet et vous avez « www.google.fr » comme moteur de recherche par défaut. Donc la page google s’est affichée. Voici le mécanisme complet et regardez à quel endroit le serveur DNS est appelé.
Dans l’exemple ci-dessus, on voit que la requête « quelle est l’adresse de www.google.fr » a répondu 74.125.230.248. Cette requête s’appelle une résolution de nom de domaine.
Si l’on poursuit, on peut constater que le serveur DNS n’est utilisé que sur la partie 1-Question et 2-Réponse. Une fois que l’ordinateur a récupéré l’adresse du serveur à joindre, il n’a plus besoin du serveur DNS.
Cette adresse IP n’est pas une adresse au hasard. Elle correspond bien à un des serveurs de Google. (il y en a évidemment un grand nombre). Donc, si dans votre dans la barre d’adresse de votre navigateur, vous tapez : http://74.125.230.248, la page de recherche de Google doit s’afficher.
Attention, cela fonctionne à l’heure ou j’écris ces lignes, mais ce ne sera peut-être pas le cas au moment ou vous les lirez. (le serveur 74.125.230.248 sera peut-être éteint ? ou affecté à de nouvelle tâches ?)
Pour faire le test vous cliquer sur : http://74.125.230.248
NB du 05/01/2016 : Comme je vous le disais au-dessus, l’adresse peut avoir changé, et c’est le cas : Essayez maintenant avec http://74.125.206.94
Et chez moi ?
La plupart des personnes ignorent cette notion est c’est bien compréhensible. Alors comment cela peut-il fonctionner chez moi puisque je n’ai jamais renseigné ces serveurs ?
Les serveurs DNS fonctionnent en cascade. Pour expliquer cela on pourrait dire que lorsque qu’un serveur ne connait pas la réponse, il va demander à son « parent »
Chez vous, le serveur DNS est votre box (sauf si vous avez renseigné autre chose), et si votre box ne sait pas répondre, elle va interroger son parent : le(s) serveur(s) DNS de votre fournisseur d’accès. Cela peut remonter comme ça jusqu’aux serveurs racines. (on va dire pour simplifier que les serveurs DNS racines sont les serveurs de base du système : on ne peut pas remonter plus haut.)
La configuration DNS de votre ordinateur (ou tablette, et tout autre équipement connecté chez vous) est fournie par le serveur DHCP.
Un fichier
Peut-être en entendrez vous parler si vous travaillez dans l’informatique (ou si vous bricolez un peu). Un fichier présent sur la machine peut remplacer les requêtes DNS.
Ce fichier est le fichier « host » (hôte en français). Il va contenir la correspondance entre les adresses demandées et les adresses IP. Sur chaque ligne de ce fichier on va retrouver au début l’adresse IP suivi d’un espace ou d’une tabulation et ensuite du ou des nom(s) correspondant à cette adresse. Exemple : 74.125.230.248 www.google.fr
La sécurité
Parlons juste un peu de sécurité.
Pour bien comprendre de quoi je veux parler, je vais reprendre l’exemple du téléphone :
Imaginez que vous ayez entre les mains un faux annuaire (piraté) ou les numéros de téléphone ne soient pas les bons, et vous renvoie vers des pirates.
Vous ayez besoin d’appeler votre banque : Vous appelez le numéro de téléphone et vous allez forcément tomber sur des pirates (mais vous ne le savez pas).
Au bout du fil, on peut vous demander des informations confidentielles, et vous les donnerez en tout confiance !!!
Il faut bien comprendre que cela peut être pareil avec des serveurs DNS et qu’il existe des virus qui modifie vos paramètres réseaux ou votre fichier « hosts » pour faire pointer les requêtes DNS vers des serveurs pirates.
Une des blagues des administrateurs réseaux est de modifier, au sein de l’entreprise, une des entrées DNS d’un site vers un autre site. (Par exemple : faire pointer Facebook vers le site des Tortues Ninja ! : ainsi chaque fois que quelqu’un voudra aller sur Facebook, il se retrouvera sur le site des Tortues Ninja)
Changer de DNS
Sachez qu’il est tout à fait possible de changer de DNS. Lorsque vous utilisez votre connexion Internet, les adresses des serveurs DNS sont généralement ceux de votre FAI, mais sachez qu’il est possible d’en changer. Vous trouverez ci-dessous des sites proposant des listes de serveurs :
et je peux également vous en donner 2 très connus :
OpenDNS : 208.67.220.222 et 208.67.222.220
Google : 8.8.8.8 et 8.8.4.4
Pourquoi changer de DNS ?
Je vois 2 raisons principales pour changer de DNS :
Si vous avez peur d’être « espionné », (car un serveur DNS) sait exactement quels sites vous consultez, mais il peut également vous renvoyer vers les sites qu’il a choisi.
Si vous trouvez votre accès un peu lent, (car rappelez-vous un serveur DNS est appelé à chaque page consultée) et plus il mettra du temps à répondre, plus la page mettra du temps à s’afficher.
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I managed to recover some of my strength. Although I can cultivate to the innate level in this world, at most I didn t have any bad skills.Following his order, the crowd began to cut off the stream and build a dam directly on the stream.
The news quickly spread to Wei Nao. As the king of Great Wei, he was naturally very excited and rewarded a group of generals, among which Wei Xiao was also named the king of Xiaoyi County.Among the five countries, the Ming country has existed in name only, not to mention occupying a small territory, and most 10 mg cbd gummy bears benefits reviews and guide to choosing the best of them are adjacent to the extreme northern ice sheet and the vast desert, and it is relatively rich to the north of the Changhua River, but the overall It s gone, it s only a matter of time before Jing Guo is wiped out.
If this goes up, Lin Haoming can t doubt that many people will be able to reach the foundation building stage in a hundred years.Li Guangxun looked at him and said coldly Your Highness, you are indeed a good person, but it is a pity that your existence blocks the way of others.
When panicked, Lin Haoming ordered again in a low voice Everyone, slow down, to ignore the artillery fire and speed up for you.What a Introduction joke. Waiting until noon on the seventh day, Lu Zhong Only then did I know that Lin Haoming ran away with someone, and I was such a slow responsive person.
When the news reached King Qing s capital, everyone in the capital seemed to be panicking.Originally, you were going back to the capital. It seems that the meaning of Prince Rong s visit is even more the same.
Hearing this voice, everyone felt strange. If it was three people fighting among themselves, then after killing two companions, the remaining one should have run away, so why would they still shoot.I originally planned to open a fabric store, but now I want to buy a house.
Just as Wen and Wu of the Man Dynasty walked out of the small hall, Eunuch Wen immediately ran over to let the imperial study room continue to discuss matters before noon.This is a strange world, so it is a good thing to be cautious.
The arrival of Lin Haoming also allowed the surrounding people to give way a little.At this time Ning Lin asked personally, I might be silent again, so I stood up and said Your Majesty, no one can lead the army, but the old minister has been thinking, where did the soldiers come from The king wants to land, so where else do you need to send troops But Tu Youjun waved his hand and said, You just believe your sister, you said he can help you if he is not here, so you believed it, The Benefits of a Holistic Approach you came back seven times in those years Every time, every time you see you, have you ever suffered a little grievance, and you are not even close to half a hundred people, and you are still a man.
Surely that would be bad Tao Zhen asked directly. Last night, everyone who followed Mrs.Obviously, it was to reward everyone at the end of the year.
What is Lin Haoming s background It s not easy for a while.After all, the city god also needs incense, and the city god is regarded as the direct subordinate of the Zhenguo Shenlong, especially the city gods in Yongzhou today.
On your side, a rotation system is implemented. When I come back, it s not that some people can t leave every time.As she started to practice, her talent was manifested, and now she became the more conspicuous woman beside Lin Haoming again.
As expected, when this thing saw Lin Haoming approaching, it immediately stabbed it , but this thing grows on Sweet Relief: Unlocking the Power of Cannabis Infused Gummies the tail, no matter how fast it is, no matter how flexible it is, it depends on the tail swinging, so Lin Haoming stared at the tail The Rise of CBD Gummies: A Promising Treatment Option? swinging of this guy, when it fell, he grabbed it, and then cut off the tail instantly with a hand knife up.
Li Guangxun sighed at this time. Is Old General Li seriously ill Wang Du asked with concern when he heard that.Put those things away again, the remaining ones are considered to be few, and basically cannot be divided into seven categories, and none of them are conch shells.
You The Hidden Dangers of CBD Gummies: A Guide to Avoiding Scams and Finding Quality Products killed Zhou Heng Cheng Xiao immediately understood.Lin Haoming recalled what the god said at the beginning, maybe it would be impossible for the light gate to appear and he would choose a place inaccessible, but as an arena, the seventh world has too little preparation.
You can t overcome everything. Now count the number of people together.Although it was just a sheep attack, it also forced Ye Xin to continue to send troops.
When you come to your house, you don t often build bridges and pave roads.situation, so I have become more trusting of you. As the time gets closer and closer to the most recent moment, the rumors of the entire Eternal Island are getting tighter and tighter.
There is nothing to be ordered by the general here, he is only the captain of the law enforcement, and he is needed there.It was a small room with several boxes placed outside it.
Xiao Qingmiao also wanted to get entangled in that matter at this time, and said directly You Assessing CBD Gummies as a Viable Treatment Option for ED are explaining, even if you explain, he may not doubt it, but the situation is not like that now, it is definitely complicated for Lin Haoming to ask you to let go, you want my name Learn to take the lead.
At that time, Lin Haoming also found that compared with the big boat, the advantage of the small boat is obviously smaller.Glancing at Cao Songren, he found 1. CBD Oil: Nature's Painkiller that this guy was really observant, so he also greeted Aim and shoot.
Of course, your luck is also wrong. The plane will bomb this place, otherwise You are indeed not dead yet.After a while, she came up with something like a stone tablet.
Night Breeze Can CBD Gummies Really Boost Your Mood? The Truth You Need to Know is the weakest force 5 mustknow facts about zen leaf cbd gummies in 2025 around. According to Lu Pinhong, Night Breeze has more than a dozen boats and around 2,000 people.With you appearing, the monster really moved again, but Li Shuxian seemed to have both legs broken, and there was no way to run, so he could only crawl back desperately, but he could climb far, and the monster s venom was all gone a while ago Come down.
It is just that they took back the state of Wei The Science Behind Stress and Anxiety back then.For ordinary people, this method will not be used unless it is a last resort.
Chen Shun looked at him, but asked with a sneer, Will you seduce if you win In fact, it was true.But at this moment, the sound of killing from behind was loud, and the people hiding in the cave came out, and after they came out, they did not choose to rescue Lin Haoming and others, but directly rushed into the valley, some of the people built by the enemy camp.
Bad When Fu Dian heard that, he didn t take it seriously.
Lin Haoming could not help Discover the Benefits of CBD Gummies: What You Need to Know but sigh, Wei Nao is really a wise monarch, and I am afraid that in that Fengyun Xiaolu, it will be passed down through the ages.No wonder he understands. Lin Haoming said enthusiastically.
there are no other rules. You have seen me. Chen Shun looked at Lin Haoming again and said. Zhou Heng s words sounded very touching, and Lin Haoming nodded silently.Yan Meng, I will betray you like that, right Chen Shun couldn t help asking when he saw that.
At the same time, Shu Yan had someone pretend to be Xiaoxia s rout, and retreated into Suolongguan with the other real routs.Lin Haoming didn t agree to that matter, but Shanghe Xiangu s body was weak in the past, and Taikang Mountain still needed to stabilize its own What are CBD Gummies? condition, so he didn t sign a contract for the time being.
What you practice is some means of body training, and the others are indeed family years.How is it Hu Qingding was the first to ask. Now that I am in that world, I don t have the title of a god king.
You can save a little at night. The conditions here are much better than living outside.The generals are afraid of triggering the law, so they are very conservative when using their troops, and no matter how strong the soldiers are, it is useless, so small groups always have the advantage in fighting, but as long as there are tens of thousands of people fighting, the Kun country will not be able to do it.
Everyone knows that everyone is afraid to face a big problem right now, and that is the a guide to cannabis gummies store finding quality and variety Venerable Wang who occupies the vast territory here.Li Shuxian didn t have much bad feelings for Lin Haoming.
Before seeing Lin Haoming, I was still smiling, but Lin Haoming knew what the result would be when he saw my smile.It was Lin Haoming who initiated the attack on the front line on his own initiative.
At the same time, Lin Haoming specially asked the men from the male barracks to wander outside the camp on purpose, while the other party s scouts could still see the situation outside the camp.Actually what Seeing whether King Wei said anything, Shu also asked.
Lin Haoming felt a little depressed, but soon a few Mental Clarity: The Power of Mindfulness people who came with the man walked by, and one of them looked somewhat similar to the previous man, but he was a few years younger.Chen Shun suddenly exclaimed in surprise. The people who were already a little bit desperate at this time also cheered up one by one at this time, and the monster didn t chase after everyone ran back to the woods.
That is also possible. If there is, there are two situations in particular, one is that the old dragon king has an accident, and he can stand out, and Are Sleep Gummies Suitable for Toddlers? A Comprehensive Review of Safety and Benefits the other is that the dragon king in other places has an accident, the old dragon king went to this place, and he takes over He Xiangu said thoughtfully.
Seeing me talking like that, Wei Ying felt helpless for a while, and asked Zhu Feiling Marshal Zhu, when it comes to military affairs, he is a leader in the court.At this time, a man s voice came from outside, the voice was not hoarse at all, and he was a very pleasant man in the imagination, and Mrs.
Lin Haoming greeted carelessly. Hu Qinghan looked at Lin Haoming like this, the corner of his mouth twitched slightly, and said nonchalantly You are Lin Haoming, I thought you would be some superhuman figure, and you are just like a normal person.Compared with the Liwei sea and the marginal sea, the inland sea is not as small as the same, and it is not that almost all areas have been proven.
The footprints left by the giant beast that escaped yesterday are too obvious, and the huge and small footprints followed all the way, so there is no need to distinguish anything.Elder Qinghan, I ve paid homage to you for a long time.
More than ten years ago, before the current emperor of Jing Kingdom was registered, as the Introduction prince, he had exchanged marriages with the princes of Kun Kingdom, and they all married their younger sisters to each other.Lin Haoming ordered. Yes, sir, just tell me. Mao Kai now feels that he has saved his life, and he doesn t care about other things.
In the blink of an eye, the two sides had already collided with hundreds of moves.In other words, his sixth uncle is about to break through, which is great.
Another elder laughed, Elder Xuan, I m afraid it s impossible for you to take away the apprentice so soon.In fact, you are just an ant. Lin Xuan s soul attack rushed into the opponent s mind, causing the opponent s confidence to collapse.
After going on for a long time, the ancient city of Qiankun stopped shaking and gradually calmed down.Reincarnation. The six worlds surrounded Lin Xuan, sweeping continuously, covering Lin Xuan.
Lin Xuan laughed after hearing this. Do you really think that it is just the three of you , Can you kill me If you have The Rise of CBD Gummies and Stress Relief a chance, get out, or don t blame me for being rude.It seems that they really underestimated Xiao Xiaoyu, that s great.
Elder Xingchen naturally knew this too, with a pair of eyes bursting out with unparalleled killing intent, boy, you have completely angered me, I will let you die without a place to boosting performance cbd gummies for ed bury you, he Introduction was really angry, he decided to kill him with one move.Below, in the mansion, it was very quiet, and there was no response at all.
If it is someone else, these spectators in Xuantian Pavilion will definitely be nervous, but Lin Xuan , They are not worried, especially those elders, they are very calm, they have seen Lin Xuan s battle before.Not long after, he heard Heishan s voice transmission, and Heishan said, boy, come quickly.
Xiao Xiyu also said, Third Grandpa, it s not that I don t follow the rules, it s just that some people bully others too much.Later, when the beast fighting was over, he was going to go back to the Xing Clan to have a look.
shocked. This is a real clan of divine beasts, stronger than the background and blood of the Golden Crow clan.They think Lin Xuan is very interesting. These people are all people who have successfully obtained the quota.
When it came out, what was sealed turned out to be the energy of heaven and earth What a terrifying power.Of these eight war servants, three of them were holy kings, and the remaining five were half Understanding the Complexity of CBD Regulations step holy kings.
The first body, Mingchen, is the ancient king body, the Hades body, and the ranking of the first sword is still higher than the opponent.How could these people in Baiyundongtian endure it.
Afterwards, Lin Xuan, Wu Yuan, and Dark Red Shenlong walked out from inside.The three strong men of Youyun Sect fell. When those people who rushed over saw this scene, their pupils shrank sharply, they were so powerful These three powerhouses are all in the mid stage of the Holy King, and they are extremely powerful.
The man from Zifu used the Dragon Elephant Finger to resist, but was beaten back and vomited blood.Invincible sword A sword light lit up, splitting the world in half.
Seeing this scene, the elders felt that it was almost the same, so they said , Ladies and gentlemen, there is an ancient cave in front of us.Elder Liuqin snorted coldly, do I still need his help if I Uncovering the Truth: Separating Fact from Fiction About Blue Vibe CBD Gummies want to kill you You were able to escape before because you had the phantom, but now that the phantom is not by your side, it is easy for me to kill you.
Xue Qi snorted coldly, but Young Master Yan Jiu sneered, isn t it You can t decide that, after finishing speaking, he walked forward, Xue Qi snorted coldly, come again, don t blame me for being rude, The law of ice emerged from his body, but for a moment, she felt dizzy, almost fainted, and she couldn t stand still, damn it, what did you do She roared crazily, but Young Master Yan Jiu sneered, it s nothing, just lit the incense, that s all.
I am afraid that even in the late stage of the Holy King, it is not as good as his soul.He has never seen a person who opened the cultivation secret room.
Yes, he is not an opponent of the peak of the Holy King, but facing such a terrible scene, Lin Xuan laughed out loud.It was a success. Gu Yue took the dragon marrow he got and returned to a manor.
It seems that he can t hold it at all, it s too strong, he is worthy of being a three soul beast master, to control such a monster, there is no problem at all, it can be done very easily.If I was lucky, it would be very dangerous to go further inside.
I can do the same without your Zifu. Do you think we have no biocore cbd gummies benefits reviews and legitimacy of cbd products background Go, open the bottom line.When they saw that their genius and powerhouse had been abolished by others, they all roared to the sky.
Holding the cauldron with one hand, he directly killed it, and the phantoms of four monsters emerged from the cauldron, threatening to devour Lin Xuan s soul.
Zaan s figure was like lightning, instantly breaking all his other legs.Zaan originally thought that those men in black would make a move, but who knew that after waiting for a while, they still showed no sign of making a move.
Tomorrow I will deal with the Yi County officialdom.Now there are guards outside, where are you going Tang Tian er bit her lips, It s safest to hide here.
He had originally planned that the paper bride would poison Granny Cai to death, so that he would have a clue in his hands, and without Granny Cai s protection, she would be left alone to be manipulated by him.Although she never admitted it in public, she did not shy away from the fact that she was Medusa when they were together.
The two wandered around the headquarters like a couple, and at the same time secretly checked the guard situation of the chamber of commerce, recorded their shift schedule and so on.Here we What are CBD Gummies and How Do They Work? come. Zaan was condescending at this time, and could see the situation at the bottom of the valley.
Yunjianyue Yan Xuehen snorted, she knew that if she attacked Zu an at this time, this enemy would never mind sneaking up on Unlock the Power of Nature: Top-Rated CBD Gummies without Corn Syrup her, Why are you here Why can t I come if you can come.Yu Yanluo covered her lips and yawned. She was seriously injured, and she was worried about Zaan just now, and her energy was exhausted.
But Just now I noticed that he didn t die by homicide, but killed himself by smashing the sky cap with his palm.At the beginning, the managers outside clamored whether they knew where it was, but they were taught by Habayashiro every minute.
Although the opponent is a grandmaster, it s not like he hasn t fought against a grandmaster before, and he has even fought against even stronger ones.Xu Yu thought he had seen through his scheme, but he didn t know that he just wanted to attract the other party s attention.
That s right, this woman has successfully attracted my son s attention.Although Nuan Baobao is practical, after all, the families who use this product are often either rich or expensive.
It doesn t matter if I have fingers or not. You chop them off I won t do it even if I chop them off one by one.Now your situation is more suitable for tempering the soul.
Seeing her acquiescence, Zaan quickly untied her clothes.It s just that it s impossible for her to be without a bit of grievance in her heart for the combination in this situation.
Although he reminded everywhere, with a look of concern, both sides were concerned.Master Zu is so young, his cultivation is really amazing.
After speaking, the vitality erupted suddenly, Yu Yanluo let out a cry, and the whole body hugged him It kept trembling.Zu an patted her hand to comfort her, Yu Yanluo came back to her senses, collected her thoughts and continued to walk forward.
By the way, I have to tell the housekeeper that the bed is about to be changed.Those people really want to ride her
Zaun hurriedly dealt with it. What about the ones behind the queen asked hastily.
Nan Xun s eyes lit up Is this a poem written by Mr.Sang If you help him, you can t make it public so that everyone will stop chasing him.
It was only a psychological effect at the time. He always felt uncomfortable when chatting with Zaan, and he returned to his own circle after a few casual sentences.He closed his eyes in pain. It is conceivable that after tonight, he will probably become the laughing stock of the people in the capital, and even a bad one will be remembered in history but he exists with a bad image.
I can t help but think of the situation when I was with Zheng Dan back then, if his body wasn t made of iron, I m afraid he really couldn t get rid of this poison.I Unlock the Power of Rest: Tips for a Healthy Sleep Cycle m not crazy, I know better now than ever before, Jian Taiding waved his hand, very dissatisfied with the other party s evaluation, This wild man has left the three sister in laws at home, and you won t be able to escape him before long.
By the way, although old man Mi s soul has been dispersed and there is no danger of taking it away, he is a master after all, and the fragments of his soul There are also some broken consciousness left, you have to guard your heart and don t be invaded by demons.
