Remove external macaddress package dependency

netbox/dcim/formfields.py

@@ -0,0 +1,26 @@
+from netaddr import EUI, AddrFormatError
+
+from django import forms
+from django.core.exceptions import ValidationError
+
+
+#
+# Form fields
+#
+
+class MACAddressFormField(forms.Field):
+    default_error_messages = {
+        'invalid': "Enter a valid MAC address.",
+    }
+
+    def to_python(self, value):
+        if not value:
+            return None
+
+        if isinstance(value, EUI):
+            return value
+
+        try:
+            return EUI(value)
+        except AddrFormatError:
+            raise ValidationError("Please specify a valid MAC address.")