diff --git a/gestion/gen_confs/firewall_new.py b/gestion/gen_confs/firewall_new.py
index 175590bb..afa71ca7 100755
--- a/gestion/gen_confs/firewall_new.py
+++ b/gestion/gen_confs/firewall_new.py
@@ -1418,17 +1418,17 @@ class firewall_gordon(firewall_crans) :
 
     def nat_table(self) :
         self.anim = anim('\tStructure de la table nat')
-        iptables('-t nat -N TEST_MAC-IP')
+        iptables('-t filter -N TEST_MAC-IP')
 
-        iptables("-t nat -P PREROUTING ACCEPT")
-        iptables("-t nat -A PREROUTING -i lo -j ACCEPT")
-        iptables("-t nat -A PREROUTING -d 224.0.0.0/4 -j DROP")
+        iptables("-t filter -P FORWARD ACCEPT")
+        iptables("-t filter -A FORWARD -i lo -j ACCEPT")
+        iptables("-t filter -A FORWARD -d 224.0.0.0/4 -j DROP")
 
         for net in NETs['fil'] + NETs['adm'] + NETs['wifi'] :
-            iptables("-t nat -A PREROUTING -s %s -j TEST_MAC-IP" % net)
+            iptables("-t filter -A FORWARD -s %s -j TEST_MAC-IP" % net)
 
-        iptables("-t nat -P PREROUTING ACCEPT")
-        iptables("-t nat -P OUTPUT ACCEPT")
+        iptables("-t filter -P FORWARD ACCEPT")
+        iptables("-t filter -P OUTPUT ACCEPT")
         print OK
 
     def filter_table_tweaks(self) :