You usually set up dual stack any ways, so it still will work for IPv4 devicesAnd set up and use IPv6 will not stop machines from using Novell Network (IPX/SPX), IPv4, Apple Talk etc It will just not pass the router/firewallSo adding IPv6 to your net work actually is only advantages Both in performance and security, as you should have 256 public /64 LAN with IPv6 And all IPv6 LAN should have /64 netmasks Which gives 2^64 IPv6 addresses in a LANBecause if this, you give devices to different LAN depending on security, and makes the rules in the firewalls so much easier to write No need to fight NAT
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