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+# DHCP
+
+## Installation dhcp 
+
+    apt-get install isc-dhcp-server
+
+## commande dhcp
+
+    systemctl start isc-dhcp-server
+    systemctl stop isc-dhcp-server
+    systemctl restart isc-dhcp-server
+---------
+
+### Configuration dhcpd.conf
+
+#### atteindre fichier de configuration : 
+
+    cd /etc/dhcp
+    nano dhcpd.conf
+
+#### dhcpd.conf : 
+
+# dhcpd.conf
+
+    option domain-name "networkandco.org";
+
+    default-lease-time 600;
+    max-lease-time 7200;
+    allow booting;
+    allow bootp;
+
+
+    ddns-update-style none;
+
+
+    server-identifier 192.168.40.150;
+    authoritative;
+    ddns-update-style interim;
+
+
+#VLAN 2 
+
+    subnet 192.168.40.0 netmask 255.255.255.0 {
+        range  dynamic-bootp 192.168.40.20 192.168.40.100;
+        option routers 192.168.40.254;https://gitlab.univ-lille.fr/hugo.lacherez.etu/networkandco.git
+        option subnet-mask 255.255.255.0;
+        option domain-name "networkandco.org";
+        option domain-name-servers 192.168.40.151;
+    }
+
+#VLAN 3 
+
+    subnet 192.168.50.0 netmask 255.255.255.0 {
+        range  dynamic-bootp 192.168.50.20 192.168.50.100;
+        option routers 192.168.50.254;
+        option subnet-mask 255.255.255.0;
+        option domain-name "networkandco.org";
+        option domain-name-servers 192.168.40.151;
+    }
+
+#VLAN 4 
+
+    subnet 192.168.60.0 netmask 255.255.255.0 {
+        range  dynamic-bootp 192.168.60.20 192.168.60.100;
+        option routers 192.168.60.254;
+        option subnet-mask 255.255.255.0;
+        option domain-name "networkandco.org";
+        option domain-name-servers 192.168.40.151;
+    }
+-----
+    host dns {
+    hardware ethernet "MAC ADRESSE SERVEUR DNS"
+    fixed-adress "IP DNS"
+    }
+
+    //PARTIE DNS DYNAMIQUE
+
+    host dhcp {
+    hardware ethernet "MAC ADRESSE SERVEUR dhcp"
+    fixed-adress "IP dhcp"
+    }
+--------
+
+    key "dhcp-update-key" {
+        algorithm hmac-md5;
+        secret "7R1U767pLKhR+O/0hF11TfeNmoVpVU+lfLnL3GhvWpI=";
+    }
+
+    zone networkandco.org {
+    primary 192.168.40.151;
+    key "rndc-key";
+    }
+
+    zone 40.168.192.in-addr-arpa
+    {
+    primary 192.168.40.151;
+        key "rndc-key";
+    }
+
+    ddns-domainname "networkandco.org.";
+    ddns-rev-domainname "in-addr.arpa.";
+
+
+        
+
+
+
+### Configuration dhcp inter-vlan:
+
+#### Installation package inter-vlan :
+
+    sudo apt-get update
+    sudo apt-get install vlan
+
+#### configuration fichier /etc/network/interfaces
+
+     
+    nano /etc/network/interfaces :
+    
+    # The primary network interface
+    allow-hotplug enp0s3
+    iface enp0s3 inet static
+        address 192.168.40.150 //adresse ip static du serveur dhcp
+        gateway 192.168.40.254
+
+
+    #INTER VLAN
+
+    #VLAN 2
+
+    auto enp0s3
+    iface Admin inet static
+        address 192.168.40.3
+        netmask 255.255.255.0
+        gateway 192.168.40.254
+    vlan-raw-device enp0s3
+
+    #VLAN 3
+
+    auto enp0s3
+    iface Comptabilite inet static
+        address 192.168.50.3
+        netmask 255.255.255.0
+        gateway 192.168.50.254
+    vlan-raw-device enp0s3
+
+    #VLAN 4
+
+    auto enp0s3
+    iface Production inet static
+        address 192.168.60.3
+        netmask 255.255.255.0
+        gateway 192.168.60.254
+    vlan-raw-device enp0s3
+
+### TIPS !
+
+    -Ne pas oublier chmod sur les fichiers config dhcp/dns
+    activer les interfaces 
+
+    -Pour les machines en STATIC ne pas oublier de précisier le DNS dans le fichier /etc/network/interfaces:
+
+        allow-hotplug "interface"
+        iface "interface" inet static
+            address "adresse ip static"
+            gateway "adresse passerel"
+            dns-search "DNS"
+            dns-namesservers "IP DNS"
+