diff --git a/gestion/ipt.py b/gestion/ipt.py
index 37c0a1c9..e9a79d47 100644
--- a/gestion/ipt.py
+++ b/gestion/ipt.py
@@ -187,11 +187,14 @@ ACCEPT' % (dev, proto, ip, port))
                     mac=machine.mac()
                     break
 
-        self.filter.blacklist_src('-m mac --mac-source %s -j REJECT --reject-with icmp6-port-unreachable' % mac)
         if ip:
             self.filter.blacklist_dst('-d %s -j REJECT --reject-with icmp6-adm-prohibited' % ip)
+        elif mac == '<automatique>':
+            # else: si mac auto, c'est normal de pas avoir pu calculer l'ip
+            return
         else:
-            print "Ipv6 de la machine %s impossible à calculer" % machine.nom()
+            print (u"Ipv6 de la machine %s impossible à calculer" % machine.nom()).encode('utf-8')
+        self.filter.blacklist_src('-m mac --mac-source %s -j REJECT --reject-with icmp6-port-unreachable' % mac)
 
 
     def version(self):