
20 Part One • Theory
• The problem of end-to-end interoperability across routing
domains in which IP addresses may not be globally unique.
A working understanding of TCP/IP networking fundamentals is a
prerequisite for understanding these issues; the Appendix should help
whether you need a crash course or a quick refresher.
2.1 Protocol Life Expectancy
Despite an active development community and enthusiastic supporters for
over a decade, as of 2002 the vast majority of Internet traffic continues to
rely on the version (version 4) of the Internet Protocol (IP) published in 1981
in RFC 791, “Internet Protocol.” Despite the rapid product lifecycles we’ve ...