So the issue here is that the deploying node want to talk to the region controller over the same IP address that the rack controller talks to the region controller. Based on your report your saying that the rack controller has two interfaces? One to talk to the region and another for the machines to boot from?
MAAS architecture is to have the deploying machines to be able to directly talk to the region controller. There is a way to configure your systems to perform in this manner, but I want to be sure that this is the problem you are experiencing?
So the issue here is that the deploying node want to talk to the region controller over the same IP address that the rack controller talks to the region controller. Based on your report your saying that the rack controller has two interfaces? One to talk to the region and another for the machines to boot from?
MAAS architecture is to have the deploying machines to be able to directly talk to the region controller. There is a way to configure your systems to perform in this manner, but I want to be sure that this is the problem you are experiencing?