--- a/src/twisted/test/test_udp.py
+++ b/src/twisted/test/test_udp.py
@@ -15,6 +15,8 @@ from twisted.internet.defer import Defer
 from twisted.internet import protocol, reactor, error, defer, interfaces, udp
 from twisted.python import runtime
 
+import unittest as pyunit
+
 
 class Mixin:
 
@@ -500,6 +502,7 @@ class ReactorShutdownInteractionTests(un
 
 
 
+@pyunit.skip("Multicast networking doesn't work with ")
 class MulticastTests(unittest.TestCase):
 
     def setUp(self):