diff --git a/ip_pool/migrations/0002_change_unique.py b/ip_pool/migrations/0002_change_unique.py
new file mode 100644
index 0000000..307ce34
--- /dev/null
+++ b/ip_pool/migrations/0002_change_unique.py
@@ -0,0 +1,23 @@
+# Generated by Django 2.1 on 2018-10-05 15:17
+
+from django.db import migrations
+import djing.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ip_pool', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='ipleasemodel',
+            name='mac_addr',
+            field=djing.fields.MACAddressField(blank=True, integer=True, null=True, verbose_name='Mac address'),
+        ),
+        migrations.AlterUniqueTogether(
+            name='ipleasemodel',
+            unique_together={('ip', 'network', 'mac_addr')},
+        ),
+    ]
diff --git a/ip_pool/models.py b/ip_pool/models.py
index 7e87166..2186559 100644
--- a/ip_pool/models.py
+++ b/ip_pool/models.py
@@ -156,14 +156,14 @@ class IpLeaseManager(models.Manager):
         if lease_live_time is None:
             raise ImproperlyConfigured('You must specify LEASE_LIVE_TIME in settings')
         senility = now() - timedelta(seconds=lease_live_time)
-        return self.filter(lease_time__lt=senility, is_active=False)
+        return self.filter(lease_time__lt=senility)
 
 
 class IpLeaseModel(models.Model):
     ip = models.GenericIPAddressField(verbose_name=_('Ip address'), unique=True)
     network = models.ForeignKey(NetworkModel, on_delete=models.CASCADE,
                                 verbose_name=_('Parent network'), null=True, blank=True)
-    mac_addr = MACAddressField(verbose_name=_('Mac address'), null=True, blank=True, unique=True)
+    mac_addr = MACAddressField(verbose_name=_('Mac address'), null=True, blank=True)
     lease_time = models.DateTimeField(_('Lease time'), auto_now_add=True)
     is_dynamic = models.BooleanField(_('Is dynamic'), default=False)
     is_active = models.BooleanField(_('Is active'), default=True)
@@ -198,7 +198,7 @@ class IpLeaseModel(models.Model):
         verbose_name = _('Employed ip')
         verbose_name_plural = _('Employed ip addresses')
         ordering = ('-id',)
-        unique_together = ('ip', 'network')
+        unique_together = ('ip', 'network', 'mac_addr')
 
 
 # class LeasesHistory(models.Model):
diff --git a/periodic.py b/periodic.py
index fd4f9c4..42c5ed9 100755
--- a/periodic.py
+++ b/periodic.py
@@ -94,7 +94,7 @@ def main():
                 )
                 print(l.comment)
 
-    signals.pre_delete.connect(abontariff_pre_delete, sender=AbonTariff)
+    # signals.pre_delete.connect(abontariff_pre_delete, sender=AbonTariff)
 
     # manage periodic pays
     ppays = PeriodicPayForId.objects.filter(next_pay__lt=now) \
@@ -103,7 +103,7 @@ def main():
         pay.payment_for_service(now=now)
 
     # Remove old inactive ip leases
-    IpLeaseModel.objects.expired().delete()
+    IpLeaseModel.objects.expired().filter(is_active=False).delete()
 
     # sync subscribers on NAS
     threads = tuple(NasSyncThread(nas) for nas in NASModel.objects.