nanog mailing list archives
Re: classful routes redux
From: "Stephen J. Wilcox" <steve () telecomplete co uk>
Date: Thu, 3 Nov 2005 00:58:25 +0000 (GMT)
On Wed, 2 Nov 2005, Fred Baker wrote:
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,
not according to my view of the internet.. /8: 18 /9: 5 /10: 8 /11: 17 /12: 79 /13: 179 /14: 335 /15: 651 /16: 8553 /17: 2855 /18: 4793 /19: 10791 /20: 11877 /21: 9990 /22: 13168 /23: 14299 /24: 93293
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.
well, /56 /48 /32 seem to have resonance but are not special in any way
All of which seems a little twisted to me.
you think? :)
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.
classes are bad. but recognise v6 is a bit different, /48 or /56 is the per site bit which is not comparable to v4. then /32 is is largest generally accepted prefix for bgp. this suggests anything can happen from 0-32 in bgp and anything can happen in provider igp for 32-48 or 32-56 and again anything in end user igp for 48/56-128 repeat 3 times, twice daily. classes are bad, v6 is not v4 Steve
Current thread:
- Re: Using BGP to force inbound and outbound routing through particular routes, (continued)
- Re: Using BGP to force inbound and outbound routing through particular routes Richard A Steenbergen (Nov 02)
- classful routes redux bmanning (Nov 02)
- Re: classful routes redux Fred Baker (Nov 02)
- Re: classful routes redux Bill Woodcock (Nov 02)
- Re: classful routes redux Fred Baker (Nov 02)
- Re: classful routes redux Bill Woodcock (Nov 02)
- Re: classful routes redux Kevin Loch (Nov 02)
- Re: classful routes redux Richard A Steenbergen (Nov 05)
- Re: classful routes redux Geoff Huston (Nov 05)
- Re: classful routes redux Niels Bakker (Nov 02)
- Re: classful routes redux Stephen J. Wilcox (Nov 02)
- Re: classful routes redux Todd Vierling (Nov 03)
- Re: classful routes redux Richard A Steenbergen (Nov 03)
- Re: classful routes redux Stephen J. Wilcox (Nov 03)
- Re: classful routes redux bmanning (Nov 03)
- Re: classful routes redux Patrick W. Gilmore (Nov 03)
- Re: classful routes redux Russ White (Nov 04)
- Re: classful routes redux Joe Abley (Nov 04)
- Re: classful routes redux Russ White (Nov 04)
- Re: classful routes redux Joseph S D Yao (Nov 04)
- Re: classful routes redux Michael . Dillon (Nov 07)