I keep lots of stuff on top of my front-loading washing machine – detergents, pegs and so on. NAT provides a security benefit in the same way that a front-loading washing machine provides a storage benefit.
Karl Auer, August 2008
NAT came into existence because of IPv4 address scarcity. With IPv6, that reason disappears. So, if we no longer need to multiplex addresses, should we retain NAT?