Third Generation Internet Revealed: Reinventing Computer Networks with IPv6

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2022

L. E. HughesThird Generation Internet Revealedhttps://doi.org/10.1007/978-1-4842-8603-6_11

11. The Future of Messaging with No NAT

Lawrence E. Hughes¹  

(1)

Frisco, TX, USA

 

In the Second Internet (the one being used by most people today, based on IPv4), most nodes do not have public (globally routable) IP addresses. There are simply not enough of these to go around. Those addresses have mostly all been allocated. Today most Internet users are second-class netizens, with only private addresses. These are addresses that work only in their subnet and cannot accept incoming connections. This has a major impact on messaging.

First off, let’s define public and private ...