I've been reading some articles about IPv6 and I'm currently playing with some addresses on a VPS.
Recently I was thinking on a typical home/office IPv4 network. We're used to have a local DHCP server running giving private IPs,
RFC1918 to our machines and than use NAT to translate the traffic between a public ISP provided IP and our internal network.
I do understand that NAT translation was just a measure to deal with the end of IPv4 and since we've a lot of IPv6 addressing space available we can just give every computer on the world a unique IPv6 and not worry with it — network Security will still be addressed by firewalls in a not block-all NAT fashion.
However... If every host has a public IPv6 what happens to my network if the ISP dies / changes / external network is down for some reason? How can I ensure local communication? How can I avoid having to reconfigure a lot of software in case of ISP change (since the IPv6 prefix will change)?
What would be the correct way to address those concerns? Can I interlay make use a machine always have the same IP? Even if that IP is public? I've heard about a private IP space in IPv6, does that work in the same way as IPv4 or does it "append" to my IPS prefix? How does machines get their IPs after all? Should they configure them as static?