On 30/12/2016 08:30, John R Levine wrote: >>> I might be able to use ULAs but I have no idea how well ULAs actually work >> >> Exactly like any other global-scope IPv6 address. They just work. (I speak >> from experience.) > > How do I tell my router that the ULAs on the home side of the router are > different from ULAs on the cableco side? Your ULAs are all in your ULA /48 prefix. I'm not clear why the cableco would be using ULAs, but if they do, those address will be in the cableco's ULA /48. No confusion is possible, and as a border router, it SHOULD drop outbound packets with source addresses in your ULA /48. >> If you want static addresses on your servers, it's no different from any >> other static address. But maybe I am not understanding your concern. > > If I knew I had an address range that held still, I would use DHCPv6 and see > how many of my devices handle it. What happens if I have ULA addresses handed > out by DHCPv6 and global addresses from SLAAC? Do I have to turn off SLAAC? In the router advertisements, the prefix information option for the ULA prefix would need its A flag turned off. > (If this stuff is all written down somewhere, I would be thrilled to get > the reference.) This is more for v6ops or even ipv6-ops@xxxxxxxxxxxxxxxx. To be honest I don't know if any of the IPv6 books covers this stuff in detail. Brian