Hi Gert,
why would anyone want to build this with IPv4? Bandwidth is extremely constrained. Agencies may choose to optimize for performance.
You might not have noticed, but there seems to be a shortage of IPv4...
Thanks, I’ve been noticing since 1991.
So whatever you are aiming for, the changes for "you'll get a big chunk of unused IPv4 addresses, for free" are close to zero.
Agencies are using prefixes from their existing allocations. Right now, that’s not problematic because their needs today are tiny. However, this builds momentum in a direction away from aggregation. As they hit address space constraints, they are then likely to resort to private IPv4 (RFC 1918) addressing. We can help them by giving them a clear path to a different alternative. Tony