>>> DNS64 is not the only solution for a ISP to go IPv6 only. >> 64 was motivated by the need for a 6-only *enterprise* > > And DNS64 requires NAT in the core and a fork lift upgrade of the > CPE to support IPv6. no. let's try reading what i said again. i requires nat at the edge of the V6-ONLY ENTERPRISE. considering the enterprise is v6-only and trying to talk to a v4 world, address translation is inevitable. randy