diff --git a/attributs.py b/attributs.py
index 3501199..3f01752 100644
--- a/attributs.py
+++ b/attributs.py
@@ -678,6 +678,7 @@ class ipHostNumber(Attr):
     category = 'base_tech'
     can_modify = [nounou]
     ldap_name = "ipHostNumber"
+    default = '<automatique>'
 
     def parse_value(self, ip):
         if ip == '<automatique>':
@@ -697,6 +698,7 @@ class ip6HostNumber(Attr):
     category = 'base_tech'
     can_modify = [nounou]
     ldap_name = "ip6HostNumber"
+    default = '<automatique>'
 
     def parse_value(self, ip6):
         if ip6 == '<automatique>':
@@ -759,6 +761,7 @@ class ipsec(Attr):
     legend = u'Clef wifi'
     category = 'wifi'
     ldap_name = "ipsec"
+    default = u'auto'
 
     def parse_value(self, val):
         if len(val) in [10, 22]: