My solution integrates in other networks while having its own private addressing. Think something like a VPN (it's not a VPN but that's a story for an other day

My solution integrates in other networks while having its own private addressing. Think something like a VPN (it's not a VPN but that's a story for an other day). Even if I allocate a random subnet like "10.5.212.0/24" I still take the risk of being unlucky and conflicting with something. On top of that I then only have 256 individual IPs to play with which means that I need to have some kind of dynamic allocation scheme instead of just using the MAC address to have a globally unique ID. This is of course even worse if you want to allocate multiple subnets. IPv6 is much simpler to deal with.