I’m very happy I started a thread about this.
I don’t think I can make use of 6to4 given the limitations of Packet Tracer. Well, better stick with IPv4 in Packet Tracer until I have the money for Cisco equipment or maybe plan on spending $115/year (€99) so I can make use of 1024 nodes max. I might have questions regarding how carriers use of IPv4 NAT pools. This could be interesting. Might be beyond my knowledge until I gain experience in network engineering. I’m not sure if CCNP or CCIE covers that.
Until then, thank you everyone for the answers.