Comment 12 for bug 945505

So is this a reasonable work-around for now?

=== modified file 'juju/providers/ec2/machine.py'
--- juju/providers/ec2/machine.py 2011-10-11 10:59:04 +0000
+++ juju/providers/ec2/machine.py 2012-11-08 15:38:17 +0000
@@ -17,6 +17,6 @@
     """
     return EC2ProviderMachine(
         instance.instance_id,
- instance.dns_name,
- instance.private_dns_name,
+ instance.ip_address,
+ instance.private_ip_address,
         instance.instance_state)