Use django-ratelimit-backend.

cab/urls/accounts.py

@@ -1,13 +1,16 @@
 from django.conf.urls import url, patterns, include
 
+from ratelimitbackend.views import login
 from cab.views import accounts
 
 urlpatterns = patterns('',
-    url(r'^',
-        include('django.contrib.auth.urls')),
     url(r'^register/$',
         accounts.CabRegistrationView.as_view(),
         name='registration_register'),
+    url(r'^login/$',
+        login,
+        {'template_name': 'registration/login.html'},
+        name='auth_login'),
     url(r'^',
         include('registration.backends.default.urls')),
 )

setup.py

@@ -126,6 +126,7 @@ def find_package_data(where='.', package='',
     'django-taggit==0.10',
     'django-comments-spamfighter>=0.4',
     'django-simple-captcha>=0.4.0',
+    'django-ratelimit-backend==0.6.2',
 ]
 
 setup(