Custom fields don't work with the interface list at present. Trying to fix export and InterfaceListFilterForm now.

netbox/dcim/views.py

@@ -1558,7 +1558,7 @@ class InterfaceBulkImportView(PermissionRequiredMixin, BulkImportView):
 class InterfaceListView(ObjectListView):
     queryset = Interface.objects.all()
     filter = filters.InterfaceFilter
-    filter_form = forms.InterfaceFilterForm
+    filter_form = forms.InterfaceListFilterForm
     table = tables.InterfaceListTable
     template_name = 'dcim/interface_list.html'
 

netbox/templates/dcim/interface_list.html

@@ -10,6 +10,7 @@
             Import Interfaces
         </a>
     {% endif %}
+    {% include 'inc/export_button.html' with obj_type='interfaces' %}
 </div>
 <h1>Interfaces</h1>
 <div class="row">