diff --git a/gestion/ip6tools.py b/gestion/ip6tools.py
new file mode 100755
index 00000000..714ebd59
--- /dev/null
+++ b/gestion/ip6tools.py
@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# IP6TOOLS.PY -- IPv6 manipulation routines
+#
+# Copyright © 2011 Nicolas Dandrimont <olasd@crans.org>
+#
+# Authors: Nicolas Dandrimont <olasd@crans.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import netaddr
+
+import config
+
+def mac_to_ipv6(ipv6_prefix, mac_address):
+    """Convert a MAC address (EUI48) to an IPv6 (prefix::EUI64)."""
+
+    addr = int(mac_address.bits(netaddr.mac_bare), 2)
+    ip6addr = (((addr >> 24) ^ (1 << 17)) << 40) | (0xFFFE << 24) | (addr & 0xFFFFFF)
+    n = netaddr.IPNetwork(ipv6_prefix)
+    return netaddr.IPAddress(n.first + ip6addr)