diff --git a/gestion/gen_confs/firewall_crans.py b/gestion/gen_confs/firewall_crans.py
index 9542822b..e98299fe 100755
--- a/gestion/gen_confs/firewall_crans.py
+++ b/gestion/gen_confs/firewall_crans.py
@@ -83,7 +83,8 @@ class firewall_crans :
     log_template = '-m limit --limit 1/s --limit-burst 1 -j LOG --log-level notice --log-prefix '
     filtre_flood =  '-m hashlimit --hashlimit 20 --hashlimit-mode srcip,dstip --hashlimit-name flood'
     
-    liste_reseaux_non_routables = [ ]
+    liste_reseaux_non_routables = [ '10.0.0.0/8', '172.16.0.0/12', 
+    '169.254.0.0/16', '192.168.0.0/16' , '224.0.0.0/4' ]
     
     machines = []
     debug = 1