332 Part Three • IPv6 Practice
But allowing two “::/48” IPv6 networks to be able to exchange packets
via two IPv4 nodes is a powerful transition mechanism. Recall that a
“::/80” network implies that each network can be made up of 2
16
individual
networks, where each network can support 2
64
− 2 devices.
That’s a big network! At the time of this writing, the IETF IPv6 address
allocation plan is to allocate a “::/48”-size block to enterprises as a standard
allocation. So an enterprise with a single routable IPv4 address can “self-
allocate” the same size block for transition as they are likely to hold when
they have moved to native v6 addresses.
20.2.4 6TO4NODE TO NATIVE-IPV6
What about 6to4 nodes or 6to4 networks exchanging packets with native
IPv6 nodes? ...