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You use one or two machines as load-balancers and connect them to your application servers over IPv6 only.

If your app servers need to talk with external IPv4 services you can run a box with an IPv4 and an HTTP proxy.

You don't need a HTTP proxy, you could make use of existing 6to4 technologies. Cloud providers can probably offer those for free at reduced speed as part of their IPv6 package. There are also public 6to4 routers available today, ur I wouldn't trust my company's data to flow through those.

Also Hetzner offers pure Load Balancers.

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