When you're at that moment, when you have to say, 'Yes, let's discontinue life support,' that's really challenging psychologically, no matter what your beliefs were before that moment. That's the one case that made the news, but these kinds of decisions get made every day.

Despite all kinds of centrifugal forces, the Internet's technology has stayed reasonably unified and coherent during the tremendous growth of the last 20 years, the enormous changes in underlying transmission technology and the era of telecommunications liberalization.

In the workbook and family education session, we also provide tips about communications skills and decision-making strategies, helping families figure out how to start and then have these conversations in a way that's most useful.

We were assuming a transition between IPv4 and pure IPv6. The good news is that there is also a transition path from NAT and RSIP to IPv6.

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