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            i) Modify the password script to use the IPv6 address of the VPC Router or
           ii) Use cloud-init which should take of using the IPv6 address of VPC Router.

In any case, whenever the wget is based on IPv4 or IPv6 (depending on the domain lookup) this is transparant to the VPC Router as long as the Apache process is listening on both addresses.

Note: According to latest document, password management is not supported by cloud-init. But, when it is available it should make sure that it supports IPv6

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