Iljitsch van Beijnum writes:

> And in reaction to other posts: there is no need to make the maximum
> address length unlimited, just as long as it's pretty big, such as  
> ~256 bits.

But there isn't much reason to not make it unlimited, as the overhead
is very small, and specific implementations can still limit the actual
address length to a compromise between infinity and the real-world
network that the implementation is expected to support.

> The point is not to make the longest possible addresses,
> but to use shorter addresses without shooting ourselves in the foot
> later when more address space is needed.

Use unlimited-length addresses that can expand at _either_ end, and
the problem is solved.  When more addresses are needed in one
location, you add bits to the addresses on the right; when networks
are combined and must have unique addresses, you add bits on the left.



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