IPv6 Address Planning
If you are putting together your IPv6 address plan, you'll need to consider how you should allocate subnets from the IPv6 block you received from your ISP or Internet Registry. In fact you should consider how to design the structure of your IPv6 allocation hierarchy to simplify ongoing network management once deployment has begun. The first step entails defining how much address space is required across and into the depths of your IP network to provide IPv6 address capacity for those devices requiring it. You can use your current IPv4 address allocation record as a guide to define the active utilization of your IPv4 address space. Once you've defined where you require IPv6 addresses, you'll next need to define how to perform your allocations. One approach is to simply allocate /64 subnets directly from your base ISP allocation, using a sparse, best-fit or random allocation approach. This single-tier allocation approach may work fine for small networks, but for modest to...