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The IPv6 shutoff is for clients first because NAT is a solution only for v6 client to v4 server; the way it works is you send packets to an IPv6 address that ha
by azernik 9y ago
The IPv6 shutoff is for clients first because NAT is a solution only for v6 client to v4 server; the way it works is you send packets to an IPv6 address that has an IPv4 address stuffed into 4 convenient bytes, and the NAT gateway installs a mapping for that communication. This doesn't work the other way around, because there's no way to address the IPv6 internet endpoints in an IPv4 packet to set up that initial mapping.
Generally the limitation is more about infrastructure (including private in-home routers) than about endpoint devices; Windows, OSX, iOS, Android, and Linux have all supported IPv6 for years.