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IPv4/IPv6 co-existence can take one of three forms.. One is dual stack, where your network hardware runs IPv4 and IPv6 simultaneously. Next is when you "tunnel" one protocol within another. Usually, this means taking IPv6 packets and encapsulating them in IPv4 packets.
Finally, there's Network Address Translation-Protocol Translation (NAT-PT). This works just like the name says, software or a device translates IPv6 packets into IPv4 packets.
