diff --git a/tiramisu/option/domainnameoption.py b/tiramisu/option/domainnameoption.py
index 487d3ed..304efc6 100644
--- a/tiramisu/option/domainnameoption.py
+++ b/tiramisu/option/domainnameoption.py
@@ -70,9 +70,15 @@ class DomainnameOption(IPOption):
             else:
                 min_time = 1
             regexp = r'((?!-)[a-z0-9-]{{{1},{0}}}\.){{{1},}}[a-z0-9-]{{1,{0}}}'.format(self._get_len(type_), min_time)
+            msg = _('only lowercase, number, "-" and "." are characters are allowed')
+            msg_warning = _('only lowercase, number, "-" and "." are characters are recommanded')
         else:
             regexp = r'((?!-)[a-z0-9-]{{1,{0}}})'.format(self._get_len(type_))
+            msg = _('only lowercase, number and - are characters are allowed')
+            msg_warning = _('only lowercase, number and "-" are characters are recommanded')
         if allow_ip:
+            msg = _('could be a IP, otherwise {}').format(msg)
+            msg_warning = _('could be a IP, otherwise {}').format(msg_warning)
             if not cidr:
                 regexp = r'^(?:{0}|(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){{3}}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))$'.format(regexp)
             else:
@@ -80,6 +86,8 @@ class DomainnameOption(IPOption):
         else:
             regexp = r'^{0}$'.format(regexp)
         extra['_domain_re'] = re.compile(regexp)
+        extra['_domain_re_message'] = msg
+        extra['_domain_re_message_warning'] = msg_warning
         extra['_has_upper'] = re.compile('[A-Z]')
 
         super().__init__(name,
@@ -141,6 +149,6 @@ class DomainnameOption(IPOption):
             raise ValueError(_('some characters are uppercase'))
         if not self.impl_get_extra('_domain_re').search(value):
             if warnings_only:
-                raise ValueError(_('some characters may cause problems'))
+                raise ValueError(self.impl_get_extra('_domain_re_message_warning'))
             else:
-                raise ValueError()
+                raise ValueError(self.impl_get_extra('_domain_re_message'))
diff --git a/tiramisu/option/ipoption.py b/tiramisu/option/ipoption.py
index 4775493..fe72f34 100644
--- a/tiramisu/option/ipoption.py
+++ b/tiramisu/option/ipoption.py
@@ -144,9 +144,8 @@ class IPOption(StrOption):
             ip, network = vals
             network_obj = ip_network(network)
             if ip_interface(ip) not in network_obj:
-                msg = _('"{0}" is not in network "{1}" ("{2}")')
-                raise ValueError(msg.format(ip,
-                                            network,
+                msg = _('IP not in network "{0}" ("{1}")')
+                raise ValueError(msg.format(network,
                                             opts[1].impl_get_display_name()))
             # test if ip is not network/broadcast IP
             netmask = NetmaskOption(self.impl_getname(),
@@ -166,12 +165,18 @@ class IPOption(StrOption):
             ip, network, netmask = vals
             if ip_interface(ip) not in ip_network('{0}/{1}'.format(network,
                                                                    netmask)):
-                msg = _('"{4}" is not in network "{0}"/"{1}" ("{2}"/"{3}")')
-                raise ValueError(msg.format(network,
-                                            netmask,
+                if current_opt == opts[0]:
+                    msg = _('IP not in network "{2}"/"{4}" ("{3}"/"{5}")')
+                elif current_opt == opts[1]:
+                    msg = _('the network doest not match with IP "{0}" ("{1}") and network "{4}" ("{5}")')
+                else:
+                    msg = _('the netmask does not match with IP "{0}" ("{1}") and broadcast "{2}" ("{3}")')
+                raise ValueError(msg.format(ip,
+                                            opts[0].impl_get_display_name(),
+                                            network,
                                             opts[1].impl_get_display_name(),
-                                            opts[2].impl_get_display_name(),
-                                            ip))
+                                            netmask,
+                                            opts[2].impl_get_display_name()))
             # test if ip is not network/broadcast IP
             opts[2]._cons_ip_netmask(current_opt,
                                      (opts[2], opts[0]),
diff --git a/tiramisu/option/netmaskoption.py b/tiramisu/option/netmaskoption.py
index 3bdd0ca..c850681 100644
--- a/tiramisu/option/netmaskoption.py
+++ b/tiramisu/option/netmaskoption.py
@@ -66,11 +66,11 @@ class NetmaskOption(StrOption):
             ip_network('{0}/{1}'.format(val_network, val_netmask))
         except ValueError:
             if current_opt == opt_network:
-                raise ValueError(_('with netmask "{0}" ("{1}")').format(val_netmask,
-                                                                        opt_netmask.impl_get_display_name()))
+                raise ValueError(_('the netmask "{0}" ("{1}") does not match').format(val_netmask,
+                                                                                      opt_netmask.impl_get_display_name()))
             else:
-                raise ValueError(_('with network "{0}" ("{1}")').format(val_network,
-                                                                        opt_network.impl_get_display_name()))
+                raise ValueError(_('the network "{0}" ("{1}") does not match').format(val_network,
+                                                                                      opt_network.impl_get_display_name()))
 
     def _cons_ip_netmask(self,
                          current_opt: Option,