Github user Graeme-Miller commented on the issue:
https://github.com/apache/brooklyn-server/pull/468
@geomacy a number of blueprints (e.g. Clocker) rely on the ability of nodes
to communicate via the subnet IP.
This functionality is useful in a situation where a cloud you are deploying
to gives you a private IP, but you cannot configure that cloud to allow nodes
to talk to one another via that IP. In this case, you could use this
functionality to ensure that only the public IPs are used.
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