diff --git a/gestion/gest_crans.py b/gestion/gest_crans.py
index 421c27cb..043f2e52 100755
--- a/gestion/gest_crans.py
+++ b/gestion/gest_crans.py
@@ -1501,6 +1501,10 @@ def set_machine(machine):
     except ValueError, c: err += c.args[0] + '\n'
     except EnvironmentError, c: err += c.args[0] + '\n'
 
+    try: machine.ip(result[2])
+    except ValueError, c: err += c.args[0] + '\n'
+    except EnvironmentError, c: err += c.__str__() + '\n'
+    except RuntimeError, c: err += c.args[0] + '\n' # Plus d'IP libres, peut-être à traiter differement ?
     try: machine.mac(result[1])
     except ValueError, c:
         if len(c.args)>1 and c.args[1] == 1 and isadm:
@@ -1529,10 +1533,6 @@ def set_machine(machine):
             err += c.args[0] + '\n'
 
     except EnvironmentError, c: err += c.args[0] + '\n'
-    try: machine.ip(result[2])
-    except ValueError, c: err += c.args[0] + '\n'
-    except EnvironmentError, c: err += c.__str__() + '\n'
-    except RuntimeError, c: err += c.args[0] + '\n' # Plus d'IP libres, peut-être à traiter differement ?
 
     if isadm:
         try:
diff --git a/gestion/ldap_crans.py b/gestion/ldap_crans.py
index 6f309348..51b83f7f 100755
--- a/gestion/ldap_crans.py
+++ b/gestion/ldap_crans.py
@@ -204,6 +204,10 @@ def is_actif(sanction):
         fin = int(bl[1])
     return debut < now and fin > now
 
+def log(contenu):
+    with open('/tmp/crans.log', 'a') as f:
+        f.writelines(contenu)
+        f.writelines('\n')
 
 def format_mac(mac):
     """
@@ -2856,14 +2860,15 @@ Contactez nounou si la MAC est bien celle d'une carte.""", 3)
 
         # Lock de la mac
         self.lock('macAddress', mac)
+        net = self.netv6()
         try:
             self._set('macAddress', [mac])
             if self.netv6() != 'special':
-                self.ipv6(ip6tools.mac_to_ipv6(self.netv6(), netaddr.EUI(mac)))
+                self.ipv6(ip6tools.mac_to_ipv6(net, netaddr.EUI(mac)))
             else:
                 self.ipv6(config.ipv6_machines_speciales[int(self.rid())])
         except:
-            raise ValueError('La correspondance MAC <-> EUID64 a planté. Tapez PEB et son entourage.')
+            raise ValueError('La correspondance MAC <-> EUID64 a planté. Tapez PEB et son entourage. (net : %s, mac : %s, ' % (net, mac))
         return mac
 
     def __host_alias(self, champ, new):