The setup allows each device to have its own public IPv6 addresses to access or provide services to the IPv6 Internet. However, with such a setup the device always uses the same address for outgoing traffic, which may be awful for end-user devices from the privacy perspective, since they are very easy to be uniquely identified worldwide.
Also, the network topology diagram in that post showed that each device may
/64 public IPv6 network locally, thus allowing other hosts in the
local network to also have full public IPv6. A very simple setup using IPv6
stateless address autoconfiguration (SLAAC) for such hosts, based on the IPv6
router advertisement daemon (
radvd) is explained here. However,
autoconfigured addresses have the very nasty effect of revealing the host's
MAC address, which is even worse privacy-wise since hosts become uniquely
identifiable regardless of the network they are in (see this post for a deeper
This article explains how to easily configure a Debian IPv6 router and its hosts to use temporary IPv6 addresses (privacy extensions for SLAAC) that avoid the problems mentioned above.