Comment 14 for bug 1847537

Its difficult to provide DNS information in the Curtin config consistently. Each IP address(static, DHCP, auto ip, discovered, or sticky) is linked to a subnet. When determining which subnet an interface is on DHCP and discovered IP addresses are ignored as the subnet may change based on the DHCP server. So if there is only one interface configured with DHCP no subnet will be linked to the machine. However if there are multiple interfaces it may be linked to a subnet.

I updated the spreadsheet to show how DNS configuration works on master/2.6 with one interface and with multiple. As you can see with only one interface the rack controllers IP is always used, even if dns_servers are defined. With the attached branch V1 config always gets its DNS servers from the DHCP server like V2 config currently does.