diff --git a/gestion/gen_confs/firewall.py b/gestion/gen_confs/firewall.py
index 0bd4a259..d3b45a39 100644
--- a/gestion/gen_confs/firewall.py
+++ b/gestion/gen_confs/firewall.py
@@ -1242,6 +1242,21 @@ class firewall_sable(firewall_rouge):
         tc("qdisc add dev %s root htb" % if_radin)
         tc("class add dev %s root htb rate %d ceil %d" % (if_radin, debit_max_radin, debit_max_radin))
 
+    def post_start_hook(self) :
+        self.anim = anim("\tMise en place du routage")
+        warn = ''
+        for cmd in [ 'echo 1 > /proc/sys/net/ipv4/ip_forward' ,
+            'echo 65536 > /proc/sys/net/ipv4/netfilter/ip_conntrack_max' ] :
+            status,output=getstatusoutput(cmd)
+            if status :
+                warn += output + '\n'
+        if warn :
+            print WARNING
+            if self.debug :
+                print warn
+        else :
+            print OK
+
 firewall_bleu = firewall_zamok
 
 if __name__ == '__main__' :