Comment 6 for bug 1881133

In my test environment:

>>> Subnet.objects.get_best_subnet_for_ip('10.12.19.7')
<Subnet: Subnet-Test2:10.12.19.0/24(vid=19)>
>>> Subnet.objects.get_best_subnet_for_ip('10.12.15.7')
<Subnet: Subnet-OSMgmt:10.12.15.0/24(vid=15)>

Subnet-Test2:10.12.19.0/24 is what I have referred to in this case as subnet C
Subnet-OSMgmt:10.12.15.0/24 is what I have referred to in this case as subnet B

from the cli "maas admin subnets read" I the same primary and secondary rack controllers for both subnets.

The workaround we found was to explicitly set the DNS servers on subnet C to point to the rack controllers. But I expected it to point to the rack controllers by default.