Re: Reason for disabling IVP6
You can use NAT with IPv6.
You can, but why would you want to.
NAT is schtick for connecting a whole LAN to a WAN using a single IPv4 address (useful with IPv4 because most ISPs don't give you a /24 when you sign up). If you have a native IPv6 address you'll have something like 2^64 addresses, so machines on your LAN can have an actual WAN-visible address of their own without needing a trick like NAT.
Using NAT with IPv6 is just missing the point.