Part One of a two-part article on Authentication, Authorization, and Accounting (AAA) was published in our previous issue. This time Sean Convery presents Part Two—subtitled "Protocols, Applications, and the Future of AAA."
Interest in IP Version 6 (IPv6) is growing in many parts of the Internet technical community; see, for example, the announcement from ARIN on page 39 of this issue. Transition to IPv6 is likely to be one of the greatest technical challenges in the history of the Internet. Several groups are developing parts of the overall solution by creating IPv6-capable versions of protocols such as the Dynamic Host Configuration Protocol (DHCP) or including support for IPv6 in the Domain Name System (DNS). Although not yet widely deployed, IP Network Mobility is expected to play an important part in the Internet of the future. For this reason the IETF is working on IP mobility with an eye toward IPv6. Our second article looks at the Network Mobility (NEMO) Basic Support Protocol, which is being developed by the NEMO working group in the IETF.
Depletion of IPv4 address space is not the only concern for network operators and developers these days. Questions about the long-term viability of today's routing protocols and the associated addressing systems center around a basic concern about how we can scale our networks to a size orders of magnitude larger than what we have today. A recently formed Routing and Addressing Problem Directorate (ROAP) is tasked to examine these problems in detail. Several ROAP-related sessions took place during the most recent IETF meeting, and Geoff Huston reports on these sessions and gives his analysis and commentary. Incidentally, Geoff was not present in person at this IETF meeting, but the facilities to follow an IETF meeting remotely are now of such a quality that he was able to participate from the other side of the world.
Protocol replacement or enhancement is also the theme in our final article. Dave Crocker asks the question "Is it time to replace SMTP?" Since this is an opinion piece, we invite your feedback or rebuttals.
New on our Website is a linked article index. Visit cisco.com/ipj and click on "Index Files" to explore this feature.
—Ole J. Jacobsen, Editor and Publisher