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by MayeulC 997 days ago
"Private networking" as defined by assigning private-range IP addresses are only private as long as there is no route to your network, or as long as it's isolated on a dedicated vlan (even then, there could be some rogue machines).

In the first case, you need a firewall for IPv4 anyway. In the second case, that would also work with IPv6.

Disclaimer: I know nothing about Azure/AWS internals.