
344 Part Three • IPv6 Practice
Most enterprises will obtain v6 allocations from your current v6 ISP
(ISP would provide a block from their current v6 allocation). Unlike
IPv4 allocations, where enterprises can “own” their own addresses and
move them from ISP to ISP, v6 addressing—since it is designed to be
hierarchical—works differently. Large ISPs receive large IPv6 address
blocks and allocate them to smaller ISPs and large enterprises. Your v6
addresses will almost always be part of a larger block allocated to your ISP.
You can also get a block for your enterprise from a test allocation. The
6Bone (www.6bone.com—addresses in the 3ffe::/16 range) will ...