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Re: classful routes redux

  • From: Fred Baker
  • Date: Wed Nov 02 19:19:14 2005
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On Nov 2, 2005, at 4:01 PM, Bill Woodcock wrote:


      On Wed, 2 Nov 2005, Fred Baker wrote:

actually, no, I could compare a /48 to a class A.

...which makes the /32s-and-shorter that everybody's actually getting
double-plus-As, or what?
A class A gives you 16 bits to enumerate 8 bit subnets. If you start from the premise that all subnets are 8 bits (dubious, but I have heard it asserted) in IPv4, and that all subnets in IPv6 are 16 bits (again dubious, given the recent suggestion of a /56 allocation to an edge network), a /48 is the counterpart of a class A. We just have a lot more of them.

All of which seems a little twisted to me. While I think /32, /48, / 56, and /64 are reasonable prefix lengths for what they are proposed for, I have this feeling of early fossilization when it doesn't necessarily make sense.