In message <930f3af3-09af-e3c5-f796-507047ab54a1@xxxxxxxxx>, Brian E Carpenter writes: > 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. It should also be dropping incoming traffic from ULAs it is not configured to pass. That is the job of a border router. > >> 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 -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka@xxxxxxx