diff --git a/gestion/gen_confs/firewall_new.py b/gestion/gen_confs/firewall_new.py
index 36dc8d8b..67995eb1 100755
--- a/gestion/gen_confs/firewall_new.py
+++ b/gestion/gen_confs/firewall_new.py
@@ -790,6 +790,7 @@ class firewall_komaz(firewall_crans) :
             iptables('-N %s' % chaine)
         iptables("-A FORWARD -i ens -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu")
         iptables("-A FORWARD -i crans -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu")
+        iptables("-A FORWARD -i crans.3 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu")
         iptables("-A FORWARD -i %s -j BLACKLIST_DST" % self.eth_ext )
         iptables("-A FORWARD -o %s -j BLACKLIST_SRC" % self.eth_ext )
         iptables("-A FORWARD -o %s -s ! %s -d ! %s -j FILTRE_P2P" % (self.eth_ext,self.zone_serveur, self.zone_serveur) )