On Wed, 20 Mar 2019, David Collier-Brown wrote:

> On 2019-03-20 10:28 a.m., Mikael Abrahamsson wrote:
>> 
>> This isn't a resource problem, it's a code problem. The IETF wants 10-15 
>> year old hosts to be able to connect to a network and perform basic 
>> networking. It might not be very optimized, but the basic function should 
>> be there. New functionality can optimize for different factors, but making 
>> older host stop working is frowned upon.
>
> Fortunately this is a solved problem in capacity planning: you replace 
> machines often enough that they're not constantly out of service being 
> repaired. 10 to 15 human-years is the equivalent of 70 to 105 of the 
> dog-years we use in this silly business (;-))

I have quite a number of consumer devices from 2000 or earlier still running, 
consumer endpoints (aka IoT devices) do not get updated very much, if at all.

David Lang