From what I understand about IPv6 networks, since NAT was a hack to deal with a lack of IP addresses in IPv4, NAT is a possibility, but not a requirement in an IPv6 LAN.
So taking this into account, how does the physical / logical diagram of a basic LAN change when using IPv6 without NAT?
Is there still a gateway router / firewall? Does every machine on my network require a public IP address? Can I still use a single firewall to protect all the machines behind it? What do the physical / logical diagrams look like?