diff --git a/cotisations/models.py b/cotisations/models.py
index 60e8672e..4d775ae0 100644
--- a/cotisations/models.py
+++ b/cotisations/models.py
@@ -30,6 +30,8 @@ from django.core.validators import MinValueValidator
 
 from django.utils import timezone
 
+from machines.models import regen
+
 class Facture(models.Model):
     PRETTY_NAME = "Factures émises"
 
@@ -180,3 +182,14 @@ class Cotisation(models.Model):
     def __str__(self):
         return str(self.vente)
 
+@receiver(post_save, sender=Cotisation)
+def cotisation_post_save(sender, **kwargs):
+    regen('dns')
+    regen('dhcp')
+    regen('mac_ip_list')
+
+@receiver(post_delete, sender=Cotisation)
+def vente_post_delete(sender, **kwargs):
+    cotisation = kwargs['instance']
+    if not cotisation.vente.facture.user.has_access():    
+        regen('mac_ip_list')
diff --git a/machines/models.py b/machines/models.py
index a54fdc32..54585849 100644
--- a/machines/models.py
+++ b/machines/models.py
@@ -320,8 +320,9 @@ class Service(models.Model):
 
 def regen(service):
     """ Fonction externe pour régérération d'un service, prend un objet service en arg"""
-    obj, created = Service.objects.get_or_create(service_type=service)
-    obj.ask_regen()
+    obj = Service.objects.filter(service_type=service)
+    if obj:
+        obj[0].ask_regen()
     return
 
 class Service_link(models.Model):
@@ -360,6 +361,9 @@ def machine_post_delete(sender, **kwargs):
     machine = kwargs['instance']
     user = machine.user
     user.ldap_sync(base=False, access_refresh=False, mac_refresh=True)
+    regen('dns')
+    regen('dhcp')
+    regen('mac_ip_list')
 
 @receiver(post_save, sender=Interface)
 def interface_post_save(sender, **kwargs):
diff --git a/users/models.py b/users/models.py
index b86060c7..34f20fdc 100644
--- a/users/models.py
+++ b/users/models.py
@@ -46,7 +46,7 @@ from django.contrib.auth.models import AbstractBaseUser, BaseUserManager
 from django.core.validators import MinLengthValidator
 from topologie.models import Room
 from cotisations.models import Cotisation, Facture, Paiement, Vente
-from machines.models import Interface, Machine
+from machines.models import Interface, Machine, regen
 from preferences.models import GeneralOption, AssoOption, OptionalUser
 
 now = timezone.now()
@@ -640,11 +640,18 @@ def ban_post_save(sender, **kwargs):
     user.ldap_sync(base=False, access_refresh=True, mac_refresh=False)
     if is_created:
         ban.notif_ban()
+        regen('dhcp')
+        regen('mac_ip_list')
+    if user.has_access():
+        regen('dhcp')
+        regen('mac_ip_list')
 
 @receiver(post_delete, sender=Ban)
 def ban_post_delete(sender, **kwargs):
     user = kwargs['instance'].user
     user.ldap_sync(base=False, access_refresh=True, mac_refresh=False)
+    regen('dhcp')
+    regen('mac_ip_list')
 
 class Whitelist(models.Model):
     PRETTY_NAME = "Liste des accès gracieux"
@@ -662,11 +669,20 @@ def whitelist_post_save(sender, **kwargs):
     whitelist = kwargs['instance']
     user = whitelist.user
     user.ldap_sync(base=False, access_refresh=True, mac_refresh=False)
+    is_created = kwargs['created']
+    if is_created:
+        regen('dhcp')
+        regen('mac_ip_list')
+    if user.has_access():
+        regen('dhcp')
+        regen('mac_ip_list')
 
 @receiver(post_delete, sender=Whitelist)
 def whitelist_post_delete(sender, **kwargs):
     user = kwargs['instance'].user
     user.ldap_sync(base=False, access_refresh=True, mac_refresh=False)
+    regen('dhcp')
+    regen('mac_ip_list')
 
 class Request(models.Model):
     PASSWD = 'PW'