diff --git a/machines/models.py b/machines/models.py
index f8d243d4..b7aad3e1 100644
--- a/machines/models.py
+++ b/machines/models.py
@@ -56,6 +56,9 @@ class Interface(models.Model):
     def __str__(self):
         return self.dns
 
+    def clean(self):
+        self.dns=self.dns.lower()
+
 class IpList(models.Model):
     ipv4 = models.GenericIPAddressField(protocol='IPv4', unique=True)
 
diff --git a/users/models.py b/users/models.py
index a6a29168..8e5af681 100644
--- a/users/models.py
+++ b/users/models.py
@@ -37,7 +37,7 @@ class User(models.Model):
 
     name = models.CharField(max_length=255)
     surname = models.CharField(max_length=255)
-    pseudo = models.CharField(max_length=255, unique=True, help_text="Doit contenir uniquement des lettres, chiffres, ou tirets", validators=[linux_user_validator])
+    pseudo = models.CharField(max_length=32, unique=True, help_text="Doit contenir uniquement des lettres, chiffres, ou tirets", validators=[linux_user_validator])
     email = models.EmailField()
     school = models.ForeignKey('School', on_delete=models.PROTECT, null=False, blank=False)
     comment = models.CharField(help_text="Commentaire, promo", max_length=255, blank=True)