diff --git a/tests/test_config_ip.py b/tests/test_config_ip.py
index cf09b62..aaa0c89 100644
--- a/tests/test_config_ip.py
+++ b/tests/test_config_ip.py
@@ -21,6 +21,7 @@ def test_ip(config_type):
     cfg.option('a').value.set('192.168.1.0')
     cfg.option('a').value.set('88.88.88.88')
     cfg.option('a').value.set('0.0.0.0')
+    cfg.option('a').value.set('2001:db8::1')
     if config_type != 'tiramisu-api':
         # FIXME
         with pytest.raises(ValueError):
@@ -148,8 +149,7 @@ def test_network_cidr(config_type):
         cfg.option('a').value.set('192.168.1.1')
     with pytest.raises(ValueError):
         cfg.option('a').value.set('192.168.1.1/24')
-    with pytest.raises(ValueError):
-        cfg.option('a').value.set('2001:db00::0/24')
+    cfg.option('a').value.set('2001:db00::0/24')
 #    assert not list_sessions()
 
 
@@ -197,8 +197,7 @@ def test_broadcast(config_type):
         cfg.option('a').value.set(1)
     with pytest.raises(ValueError):
         cfg.option('a').value.set(2)
-    with pytest.raises(ValueError):
-        cfg.option('a').value.set('2001:db8::1')
+    cfg.option('a').value.set('2001:db8::1')
     cfg.option('a').value.set('0.0.0.0')
     cfg.option('a').value.set('255.255.255.0')
 #    assert not list_sessions()
diff --git a/tiramisu/option/broadcastoption.py b/tiramisu/option/broadcastoption.py
index e294a7b..22c2746 100644
--- a/tiramisu/option/broadcastoption.py
+++ b/tiramisu/option/broadcastoption.py
@@ -23,27 +23,22 @@
 from ipaddress import ip_address
 
 from ..i18n import _
-from .option import Option
+from .stroption import StrOption
 
 
-class BroadcastOption(Option):
+class BroadcastOption(StrOption):
     """represents the choice of a broadcast"""
 
     __slots__ = tuple()
     _type = "broadcast address"
+    _t_type = _("broadcast address")
 
     def validate(
         self,
         value: str,
     ) -> None:
         """validate"""
-        if not isinstance(value, str):
-            raise ValueError(_("invalid string"))
-        if value.count(".") != 3:
-            raise ValueError()
-        for val in value.split("."):
-            if val.startswith("0") and len(val) > 1:
-                raise ValueError()
+        super().validate(value)
         try:
             ip_address(value)
         except ValueError as err:
diff --git a/tiramisu/option/ipoption.py b/tiramisu/option/ipoption.py
index 0ff86cb..2426796 100644
--- a/tiramisu/option/ipoption.py
+++ b/tiramisu/option/ipoption.py
@@ -31,6 +31,7 @@ class IPOption(StrOption):
 
     __slots__ = tuple()
     _type = "IP"
+    _t_type = _("IP")
 
     def __init__(
         self,
@@ -53,6 +54,9 @@ class IPOption(StrOption):
             ip_obj = ip_interface(value)
         except ValueError as err:
             raise ValueError() from err
+        self._second_level_cidr(ip_obj)
+
+    def _second_level_cidr(self, ip_obj):
         if ip_obj.ip == ip_obj.network.network_address:
             raise ValueError(_("it's in fact a network address"))
         if ip_obj.ip == ip_obj.network.broadcast_address:
diff --git a/tiramisu/option/networkoption.py b/tiramisu/option/networkoption.py
index ca2624a..d5f7c18 100644
--- a/tiramisu/option/networkoption.py
+++ b/tiramisu/option/networkoption.py
@@ -23,36 +23,22 @@
 from ipaddress import ip_network
 
 from ..i18n import _
+from .ipoption import IPOption
 from .stroption import StrOption
 
 
-class NetworkOption(StrOption):
+class NetworkOption(IPOption):
     "represents the choice of a network"
     __slots__ = tuple()
     _type = "network address"
+    _t_type = _("network address")
 
     def __init__(self, *args, cidr=False, **kwargs):
-        extra = {"cidr": cidr}
-        super().__init__(*args, extra=extra, **kwargs)
+        super().__init__(*args, cidr=cidr, **kwargs)
 
-    def validate(self, value: str) -> None:
-        super().validate(value)
-        if value.count(".") != 3:
-            raise ValueError()
-        cidr = self.impl_get_extra("cidr")
-        if cidr:
-            if "/" not in value:
-                raise ValueError(_("must use CIDR notation"))
-            value_ = value.split("/")[0]
-        else:
-            value_ = value
-        for val in value_.split("."):
-            if val.startswith("0") and len(val) > 1:
-                raise ValueError()
-        try:
-            ip_network(value)
-        except ValueError as err:
-            raise ValueError() from err
+    def _second_level_cidr(self, ip_obj):
+        if ip_obj.ip != ip_obj.network.network_address:
+            raise ValueError(_("it's not a network address"))
 
     def second_level_validation(self, value: str, warnings_only: bool) -> None:
         if ip_network(value).network_address.is_reserved: