From: Tom Mueller <tom.mueller_at_oracle.com>
Date: Thu, 21 Apr 2011 14:14:55 -0500

Your two instance IP addresses are on 192.168.3, but your DAS is on
10.0.0.1. Are you sure that multicast was validated between server
running the DAS and the servers running the instances? Typically
multicast is not configured to work across subnets.

In order for get-health to work, multicast is required between the DAS
and the instances.

Tom