diff --git a/utils/install-party/fete-du-slip b/utils/install-party/fete-du-slip
index 86853c1d..9213a8e7 100755
--- a/utils/install-party/fete-du-slip
+++ b/utils/install-party/fete-du-slip
@@ -45,6 +45,10 @@ ip6tables -P FORWARD DROP
 echo 1 > /proc/sys/net/ipv6/conf/eth1/forwarding
 echo 1 > /proc/sys/net/ipv6/conf/eth0/forwarding
 
+# On active le routage en ipv4
+echo 1 > /proc/sys/net/ipv4/conf/eth1/forwarding
+echo 1 > /proc/sys/net/ipv4/conf/eth0/forwarding
+
 # Sinon radvd vomit
 echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
 
diff --git a/utils/install-party/fin-de-la-fete b/utils/install-party/fin-de-la-fete
index da838772..ca4adbb8 100755
--- a/utils/install-party/fin-de-la-fete
+++ b/utils/install-party/fin-de-la-fete
@@ -19,6 +19,11 @@ echo 0 > /proc/sys/net/ipv6/conf/all/forwarding
 echo 0 > /proc/sys/net/ipv6/conf/eth1/forwarding
 echo 0 > /proc/sys/net/ipv6/conf/eth0/forwarding
 
+# On désactive le routage en ipv4
+echo 0 > /proc/sys/net/ipv4/conf/all/forwarding
+echo 0 > /proc/sys/net/ipv4/conf/eth1/forwarding
+echo 0 > /proc/sys/net/ipv4/conf/eth0/forwarding
+
 # On lance arrête
 /etc/init.d/radvd stop