[ppml] [address-policy-wg] Those pesky ULAs again
Anthony A. Crumb
Crumb_Anthony_A at cat.com
Mon Jun 4 07:08:31 EDT 2007
ppml-bounces at arin.net wrote on 05/29/2007 09:58:36 AM:
> > - IPv6 space is not infinite. It's a 64-72 bit address space. That's
> > right, subnets with > 256 hosts are very uncommon today, so we've
> > 64 bits to number 256 things. That makes the space effectively on
> > long end 72 bits.
> according to <http://www.ipv6conference.com/conference.htm>, i gave a
> entitled "DHCPv6 - The Case Against Stateless Autoconfig" at
> according to <http://www.isc.org/index.pl?/sw/dhcp/dhcp4_0.php>, there's
> now code in "alpha test release" status to handle DHCPv6.
> imho, the days of EUI64 are numbered. at home i'll probably use a /120
> each LAN. at work, we might splurge and use /96's. not that a /56
> enough for my house or anything, i just want the sparseful wastitude of
> new address bits in IPV6 to all be at the top end. i'm using a /124 for
> T1, mostly to make the PTR's easy to write and read.
I agree that requireing the use of 64 bits for interface identifiers is a
monumental waste of address space. Is there a proposal of any type to
the requirement to use EUI64 interface identifiers with globally routable
> > But more importantly, we have the T-Shirt from this exercise.
> > Back in the 80's we gave out Class A's. It was the right thing
> > to do.
> was it? DEC got 126.96.36.199/8 on the basis of having 130000 employees and
> something like 10000 offices. they turned in five class B's to get the
> does anybody here think that DEC needed a class A by ARIN's current
> standards? this was a post-subnet, post-CIDR allocation.
> > I predict with the current allocation procedures IPv6 will be
> > "used up" in my lifetime. I also predict the groups today getting
> > /32's (and larger) will look like the legacy class A holders in
> > 20 years time. When your doorknob automatically requests a ULA-C
> > /64 when you bring it home, and your house has 2,000 of them as
> > individual system talks to each other we'll be looking at this quite
> > differently.
> i include this only so that i can say, i nearly agree. unless we have
> IP architecture that splits EID/RID, those doorknobs will not be
> reachable. (not that this is a problem for doorknobs but it might be
> microwave ovens or something.)
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