diff --git a/gestion/gen_confs/firewall.py b/gestion/gen_confs/firewall.py
index 5dfac087..f5835708 100644
--- a/gestion/gen_confs/firewall.py
+++ b/gestion/gen_confs/firewall.py
@@ -499,6 +499,8 @@ class firewall_komaz(firewall_crans) :
         self.anim = anim('\tFiltrage ip non routables',len(self.liste_reseaux_non_routables))
         iptables("-t nat -A RESEAUX_NON_ROUTABLES_DST -d 10.231.136.0/24 -j RETURN")
         iptables("-t nat -A RESEAUX_NON_ROUTABLES_SRC -d 10.231.136.0/24 -j RETURN")
+        iptables("-t nat -A RESEAUX_NON_ROUTABLES_DST -i crans -s 78.251.0.0/16 -j LOG --log-prefix BAD_ROUTE ")
+        iptables("-t nat -A RESEAUX_NON_ROUTABLES_DST -i crans -s 78.251.0.0/16 -j DROP")
         for reseau in self.liste_reseaux_non_routables :
             iptables("-t nat -A RESEAUX_NON_ROUTABLES_DST -d %s -j DROP" % reseau)
             iptables("-t nat -A RESEAUX_NON_ROUTABLES_SRC -s %s -j DROP" % reseau)