diff --git a/gestion/gen_confs/dhcpd_new.py b/gestion/gen_confs/dhcpd_new.py
index a0f42c4f..bcb75fcf 100755
--- a/gestion/gen_confs/dhcpd_new.py
+++ b/gestion/gen_confs/dhcpd_new.py
@@ -6,12 +6,62 @@
 Copyright (C) Frédéric Pauget
 Licence : GPLv2
 """
-
+import os
 from iptools import AddrInNet
 from gen_confs import gen_config
 from ldap_crans import hostname
 from config import NETs
 
+from pypureomapi import pack_ip, pack_mac, OMAPI_OP_UPDATE
+from pypureomapi import Omapi, OmapiMessage, OmapiError, OmapiErrorNotFound
+import struct
+
+class dydhcp:
+    def __init__(self):
+        import sys
+        sys.path.append('/usr/scripts/gestion/secrets')
+        from secrets import dhcp_omapi_keyname,dhcp_omapi_key
+        self.dhcp_omapi_keyname=dhcp_omapi_keyname
+        self.dhcp_omapi_key=dhcp_omapi_key
+    def add_host(self, ip, mac,name=None):
+        """
+        @type ip: str
+        @type mac: str
+        @type name: str
+        @raises ValueError:
+        @raises OmapiError:
+        @raises socket.error:
+        """
+        msg = OmapiMessage.open(b"host")
+        msg.message.append((b"create", struct.pack("!I", 1)))
+        msg.message.append((b"exclusive", struct.pack("!I", 1)))
+        msg.obj.append((b"hardware-address", pack_mac(mac)))
+        msg.obj.append((b"hardware-type", struct.pack("!I", 1)))
+        msg.obj.append((b"ip-address", pack_ip(ip)))
+        if name:
+            msg.obj.append((b"name", bytes(name)))
+        conn=Omapi('dhcp.adm.crans.org',9991,self.dhcp_omapi_keyname, self.dhcp_omapi_key)
+        response = conn.query_server(msg)
+        conn.close()
+                
+    def del_host(self, ip,mac):
+        """
+        @type ip: str
+        @type mac: str
+        @raises ValueError:
+        @raises OmapiError:
+        @raises socket.error:
+        """
+        msg = OmapiMessage.open(b"host")
+        msg.obj.append((b"hardware-address", pack_mac(mac)))
+        msg.obj.append((b"hardware-type", struct.pack("!I", 1)))
+        msg.obj.append((b"ip-address", pack_ip(ip)))
+        conn=Omapi('dhcp.adm.crans.org',9991,self.dhcp_omapi_keyname, self.dhcp_omapi_key)
+        response = conn.query_server(msg)
+        if response.opcode == OMAPI_OP_UPDATE:
+            response = conn.query_server(OmapiMessage.delete(response.handle))
+        conn.close()
+    
 class dhcp(gen_config) :
     """ Génération du fichier de déclaration des hosts.
     Chaque réseau servi doit être une clef du dictionnaire reseaux, 
@@ -38,6 +88,7 @@ class dhcp(gen_config) :
                     '10.42.0.0/16' : '/etc/dhcp3/generated/gratuit.liste',
                     '10.2.9.0/24' : '/etc/dhcp3/generated/appartements.liste',
                     '138.231.144.0/21' : '/etc/dhcp3/generated/wifi.liste' }
+    dhcplease='/var/lib/dhcp/dhcpd.leases'
 
 
     host_template = """
@@ -67,6 +118,27 @@ class dhcp(gen_config) :
     ######################################FIN PARTIE DE CONFIGURATION
     def __str__(self) :
         return 'dhcp'
+        
+    def lease_clean(self):
+        f=open(self.dhcplease)
+        w=open(self.dhcplease+'.new','w')
+        config=""
+        line=f.readline()
+        write=True
+        while line:
+            if line.strip().startswith('host'):
+                write=False
+            if write:
+                w.write(line)
+            if not write and line.strip().endswith('}'):
+                write=True
+            line=f.readline()
+        f.close()
+        w.close()
+        os.rename(self.dhcplease+'.new',self.dhcplease)
+        return
+
+
 
     def _gen(self) :
         """Construction de la liste des machines appartenant à un réseau
@@ -96,5 +168,9 @@ class dhcp(gen_config) :
             if hosts.has_key(net):
                 fd0.write(hosts[net])
             fd0.close()
-
+        try:
+            self.lease_clean()
+        except:
+            print("An error append during cleaning of dhcp lease")
+        
         return warnings
diff --git a/gestion/ldap_crans.py b/gestion/ldap_crans.py
index 7e0846b1..539c0897 100644
--- a/gestion/ldap_crans.py
+++ b/gestion/ldap_crans.py
@@ -3184,7 +3184,13 @@ Contactez nounou si la MAC est bien celle d'une carte.""", 3)
 
         # On vire les doublons dans reconf_ip
         reconf_ip = list(dict(zip(reconf_ip, [None]*len(reconf_ip))))
-
+        
+        # Si la configuration ip à changer on met dynamiquement à jour le dhcp
+        if reconf_ip:
+            from gen_confs.dhcpd_new import dydhcp
+            dhcp=dydhcp()
+            dhcp.del_host(self._init_data.get('ipHostNumber',[self.ip()])[0],self._init_data.get('macAddress',[self.mac()])[0])
+            dhcp.add_host(self._data.get('ipHostNumber',[self.ip()])[0],self._data.get('macAddress',[self.mac()])[0],self.nom())
         # Enregistrement
         self._save()
 
@@ -3267,6 +3273,11 @@ Contactez nounou si la MAC est bien celle d'une carte.""", 3)
         self.proprio = self.__proprietaire.Nom() # On met dans un coin le nom du proprio
         self.__proprietaire = None               # On oublie le propriétaire
         self._delete(self.dn, comment)
+        
+        # On supprime la machine du dhcp
+        from gen_confs.dhcpd_new import dydhcp
+        dhcp=dydhcp()
+        dhcp.del_host(self.ip(),self.mac())
 
         # Services à redémarrer
         self.services_to_restart('dhcp-dhcp')