known problems/assumptions:
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- does not handle protocols other than ICMP, UDP, TCP and GRE
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- assumes the handset has its own (routed) /64 ipv6 subnet
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- assumes the /128 ipv6 subnet it generates can use the nat64 gateway
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- assumes the nat64 gateway has the ipv4 address in the last 32 bits of the ipv6 address (that it uses a /96 plat subnet)
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