nuage de tags sur la liste, suppression dropdown navbar, rôles/droits sur le profil
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OS testé : **Fedora 24**\\
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Date de test : **12 novembre 2016**
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## Installer `bind`
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Lancer l'installation de `bind` et `bind-utils` en utilisant le programme `dnf`.
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`bind-utils` inclus les programmes `nslookup`, `dig` and `host`.
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```bash
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sudo dnf install bind bind-utils
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```
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Le résultat est le suivant :
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```
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Vérification de l'expiration des métadonnées effectuée il y a 1:07:23 sur Fri Nov 11 20:10:48 2016.
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Le paquet bind-utils-32:9.10.4-2.P3.fc24.x86_64 est déjà installé, ignorer
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Dépendances résolues.
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# ========================================================================================
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Package Architecture Version Dépôt Taille
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# ========================================================================================
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Installation de:
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bind x86_64 32:9.10.4-2.P3.fc24 updates 1.9 M
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Résumé de la transaction
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# ========================================================================================
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Installation 1 Paquet
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Taille totale des téléchargements : 1.9 M
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Taille d'installation : 4.0 M
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Est-ce correct [o/N] : o
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Téléchargement des paquets :
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bind-9.10.4-2.P3.fc24.x86_64.rpm 555 kB/s | 1.9 MB 00:03
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---
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Total 382 kB/s | 1.9 MB 00:05
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Test de la transaction en cours
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La vérification de la transaction a réussi.
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Lancement de la transaction de test
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Transaction de test réussie.
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Exécution de la transaction
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Installation de : bind-32:9.10.4-2.P3.fc24.x86_64 1/1
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Vérification : bind-32:9.10.4-2.P3.fc24.x86_64 1/1
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Installé:
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bind.x86_64 32:9.10.4-2.P3.fc24
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Terminé !
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```
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Les programmes `bind` et `bind-utils` sont installés.
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## Editer `named.conf`
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**1.** Modifier le fichier de configuration `/etc/named.conf`
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```bash
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sudo vim /etc/named.conf
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```
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**2.** Remplacer la ligne suivante (~11)
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```ini
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listen-on port 53 { 127.0.0.1; };
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```
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par le bloc suivant
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```ini
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listen-on port 53 { goodclients; };
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allow-query { goodclients; };
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allow-query-cache { goodclients; };
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recursion yes;
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```
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**3.** Supprimer la ligne suivante
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```ini
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allow-query { localhost;};
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```
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Voilà a quoi pourrait correspondre le fichier de configuration `named.conf`
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```ini
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acl goodclients {
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192.168.100.0/24;
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127.0.0.1;
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localhost;
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};
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options {
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listen-on port 53 { goodclients; };
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allow-query { goodclients; };
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allow-query-cache { goodclients; };
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listen-on-v6 port 53 { ::1; };
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directory "/var/named";
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dump-file "/var/named/data/cache_dump.db";
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statistics-file "/var/named/data/named_stats.txt";
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memstatistics-file "/var/named/data/named_mem_stats.txt";
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```
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## Redémarrer le service `named`
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```bash
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systemctl restart named
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```
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# systemctl enable named
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# systemctl status named
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## Modifier le paramétrage DNS
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```bash
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sudo vim /etc/resolv.conf
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```
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```ini
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nameserver 127.0.0.1
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```
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## Tester l'interrogation DNS
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Executer le code suivant
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```bash
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dig google.com
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```
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```
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; <<>> DiG 9.10.4-P3-RedHat-9.10.4-2.P3.fc24 <<>> google.com
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;; global options: +cmd
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;; Got answer:
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;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15768
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;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 5
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;; OPT PSEUDOSECTION:
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; EDNS: version: 0, flags:; udp: 4096
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;; QUESTION SECTION:
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;google.com. IN A
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;; ANSWER SECTION:
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google.com. 300 IN A 172.217.18.238
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;; AUTHORITY SECTION:
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google.com. 171791 IN NS ns1.google.com.
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google.com. 171791 IN NS ns2.google.com.
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google.com. 171791 IN NS ns4.google.com.
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google.com. 171791 IN NS ns3.google.com.
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;; ADDITIONAL SECTION:
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ns2.google.com. 171791 IN A 216.239.34.10
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ns1.google.com. 171791 IN A 216.239.32.10
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ns3.google.com. 171791 IN A 216.239.36.10
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ns4.google.com. 171791 IN A 216.239.38.10
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;; Query time: 116 msec
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;; SERVER: 127.0.0.1#53(127.0.0.1)
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;; WHEN: ven. nov. 11 21:47:14 CET 2016
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;; MSG SIZE rcvd: 191
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```
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```
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; <<>> DiG 9.10.4-P3-RedHat-9.10.4-2.P3.fc24 <<>> google.com
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;; global options: +cmd
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;; Got answer:
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;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 64308
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;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 5
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;; OPT PSEUDOSECTION:
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; EDNS: version: 0, flags:; udp: 4096
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;; QUESTION SECTION:
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;google.com. IN A
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;; ANSWER SECTION:
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google.com. 248 IN A 172.217.18.238
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;; AUTHORITY SECTION:
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google.com. 171739 IN NS ns4.google.com.
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google.com. 171739 IN NS ns3.google.com.
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google.com. 171739 IN NS ns1.google.com.
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google.com. 171739 IN NS ns2.google.com.
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;; ADDITIONAL SECTION:
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ns2.google.com. 171739 IN A 216.239.34.10
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ns1.google.com. 171739 IN A 216.239.32.10
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ns3.google.com. 171739 IN A 216.239.36.10
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ns4.google.com. 171739 IN A 216.239.38.10
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;; Query time: 0 msec
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;; SERVER: 127.0.0.1#53(127.0.0.1)
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;; WHEN: ven. nov. 11 21:48:06 CET 2016
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;; MSG SIZE rcvd: 191
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```
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## Activer le service au démarrage de l'OS
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**1.** Vérifier le status
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```bash
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systemctl list-unit-files|grep named
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```
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Résultat
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```bash
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named-setup-rndc.service static
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named.service disabled
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systemd-hostnamed.service static
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```
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**2.** Activer le démarrage du service
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```bash
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sudo systemctl enable named
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```
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Résultat
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```bash
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Created symlink from /etc/systemd/system/multi-user.target.wants/named.service to /usr/lib/systemd/system/named.service.
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```
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**3.** Vérifier
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```bash
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systemctl list-unit-files|grep named
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```
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```bash
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named-setup-rndc.service static
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named.service enabled
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systemd-hostnamed.service static
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```
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## Modifier le parefeu
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**1.** Activer le port
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Si vous voulez utiliser le cache mis en place par d'autres machines du réseau, il sera nécessaire de lever les restrictions du parefeu.
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```
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sudo iptables -A INPUT -p tcp -m tcp --dport 53 -m conntrack --ctstate NEW -j ACCEPT
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sudo service iptables save
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```
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**2.** Vérifier les règles mises en place
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```bash
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sudo iptables -L|grep domain
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```
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Résultat
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```bash
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ACCEPT tcp -- anywhere anywhere tcp dpt:domain ctstate NEW
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```
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**3.** Vérifier l'accessbilité depuis un autre poste
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Depuis un autre poste, effectuer une commande **nmap** sur l'adresse du serveur (192.168.100.1 dans notre cas).
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```bash
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nmap -v 192.168.100.1
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```
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Résultat
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```bash
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Starting Nmap 7.12 ( https://nmap.org ) at 2016-11-12 09:49 CET
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Initiating Ping Scan at 09:49
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Scanning 192.168.100.1 [2 ports]
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Completed Ping Scan at 09:49, 0.00s elapsed (1 total hosts)
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Initiating Connect Scan at 09:49
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Scanning srv-prod (192.168.100.1) [1000 ports]
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Discovered open port 53/tcp on 192.168.100.1
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Completed Connect Scan at 09:49, 0.04s elapsed (1000 total ports)
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Nmap scan report for srv-prod (192.168.100.1)
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Host is up (0.00025s latency).
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Not shown: 999 closed ports
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PORT STATE SERVICE
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53/tcp open domain
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```
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@@ -0,0 +1,18 @@
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||||
{
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||||
"uuid": "dbfa1d31-5230-44ae-bc16-30b8c52bd9ea",
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"slug": "installer-configurer-dns-cache-server-fedora",
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"title": "Cache DNS : installer et configurer",
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"author": "cedric.abonnel@gmail.com",
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"published": true,
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"published_at": "2020-04-17 18:06:26",
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"created_at": "2020-04-17 18:06:26",
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"updated_at": "2020-04-17 18:06:26",
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"revisions": [],
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"cover": "",
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"files_meta": [],
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"external_links": [],
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||||
"seo_title": "",
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"seo_description": "",
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"og_image": "",
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"category": "Informatique"
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||||
}
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