Re: draft-bourbaki-6man-classless-ipv6-00

In message <20170614095910.GE30896@gir.theapt.org>, Peter Hessler writes:
> On 2017 Jun 14 (Wed) at 11:52:27 +0200 (+0200), otroan@employees.org wrote:
> :Peter,
> :
> :> leaving a RECOMMENDED for /64 subnets is fine.  forcing it to be a MUST
> :> is not fine to me.  While the arguments in favour of /64 subnets are
> :> valid, there are many differently valid reasons to have non-/64 subnets,
> :> as mentioned many times in this (and other recent) threads.
> :
> :Which arguments matter to you?
> :What _problem_ does changing the 64 bit boundary solve for _you_?
> :
> :Ole
> 
> The problem is wasting space (I acknowledge your arguments, and reject
> them), uglyness of the addresses, and the fact that _my_ network is not
> _your_ network.
> 
> I'm already running non-/64 subnets on my personal networks.  I'm also
> running non-/64 subnets on my $work networks.
> 
> mandating /64 subnets in the _architectural specification_ is a bug,
> period.
> 
> IPv4 got rid of classful subnets in 1993, IPv6 can join the last century
> as well.

We got rid of classful subnets in 1993 *because* there were not
enough subnets to go around with them.  We didn't get rid of them
because as a concept they were bad.

Do you say that 18446744073709551616 subnets is too few to go
around?

2^64 address would have been enough to support the world using
variable length subnets.  IPng evaluated this and decided that it
was not a good idea as variable length subnets really are too
complicated.  Instead IPng went initially with 128 bit addresses
and, initially, /80 subnets so that we didn't have to deal with
variable sized subnets.  This was later changed to /64 bit subnets
to handle 64 bit mac addresses.

Mark

> -- 
> "A raccoon tangled with a 23,000 volt line today.  The results blacked
> out 1400 homes and, of course, one raccoon."
> 		-- Steel City News
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org