diff --git a/gestion/gen_confs/firewall4/base.py b/gestion/gen_confs/firewall4/base.py
index cdc69437..16cb0a0b 100644
--- a/gestion/gen_confs/firewall4/base.py
+++ b/gestion/gen_confs/firewall4/base.py
@@ -125,6 +125,10 @@ class firewall(utils.firewall_tools) :
             self.apply(table, chain)
         return chain
 
+    def mac_ip_append(self, mac, ip):
+        machine = {'macAddress':[mac], 'ipHostNumber': [ip]}
+        self.test_mac_ip_dispatch(lambda set, data: self.ipset['mac_ip'][set].add(data), machine)
+
     def test_mac_ip_dispatch(self, func, machine):
         """Détermine à quel set de mac-ip appliquer la fonction ``func`` (add, delete, append, ...)"""
         ips = machine['ipHostNumber']