You may hae heard Henning Shulzrinne's name in connection with the SIP protocol--Dr. Shulzrinne is its co-author. He is currently Professor in the Dept. of Computer Science at Columbia University. We have not heard Henning talk since some of the early Voice on the Net conferences, so we were eager to attend a recent IEEE Communications Society Chapter meeting at New Jersey Institute of Technology (NJIT) to learn what he is thinking about. His talk was titled "Internet 2.0 Challenges".
His theme was that the Internet is a core civilizational infrastructure analogous to energy and transportation, and it is currently facing a number of challenges. These challenges include network address exhaustion, routing table explosion, network ossification, securing the network infrastructure and usability/self-managed networks. The talk was scheduled for only one hour, so he could not present all his materials. You can see an online copy of the entire presentation ( www1.cs.columbia.edu/~hgs/papers/2009/IEEE-DLT-Challenges.ppt ).
One of the most interesting discussions concerned the change to the traditional assumption that an Internet host has only one address and one interface. Hosts today can have Wi-Fi, Ethernet, Bluetooth and 3G/4G communications interfaces. This enables what is called multihoming, in which a single computer or device can have multiple network interfaces or IP addresses. As the use of networking in mobile environments becomes more commonplace, multihoming could help solve the problem of migrating between different types of networks while traveling.
Since this session barely scratched the surface, we'll look for an opportunity to talk further with Henning.