[ipv6-wg] RE: [address-policy-wg] IPv6 allocations for 6RD

Fair enough, I'll bite. Given 2^32(or 4 billion) IPv4 addresses, and
say, 4 million IP's allocated to the average ISP (I'm being generous
here) there's your 0.1%. The rest of the space will go unused since
we're using 32 bits to identify these sparse blocks in the v4->v6
translation. Not counting customer /56s, 48s, /60s or whatever.

The more dangerous bit here is that you're going to have a hard time
using the other pieces of that 32 bits you've allocated to 6rd elsewhere
- it'll only give you v6 for people you're currently handing out a v4
address as well. 

I agree that handing an ISP a /24 should last them an eternity, but only
if they make sensible use of it.

Remco


-----Original Message-----
From: address-policy-wg-admin at ripe.net
[mailto:address-policy-wg-admin at ripe.net] On Behalf Of
michael.dillon at bt.com
Sent: donderdag 26 november 2009 10:12
To: address-policy-wg at ripe.net; ipv6-wg at ripe.net
Subject: RE: [address-policy-wg] IPv6 allocations for 6RD

> If a single 6rd instance is accepted as a rule the end result 
> of that will be that every ISP in the world with 
> non-contiguous allocations will be asking for a /24 next, 
> knowing full well that they're only going to use 0,1% of the 
> network side of that space, ever.

A lot of numbers have been thrown around fairly casually
in this conversation, but /24 is a nice one to focus on because
everyone understands how many /24s there are in a number space.
If we could have run the IPv4 Internet by only giving every ISP
a single /24, then we would never have run out of IPv4 addresses.

Conversely, giving every ISP an IPv6 /24 is not radical and is
not even wasteful given the large number of /24s that we have
in stock at RIPE and at IANA.

As for your comment about 0.1%, I'd like to know how you calculated
that number.

In general, I'm only interested in numbers that count /56s (or /48s)
and /32s since those are the only ones that are meaningful in making
policy.

--Michael Dillon



This email is from Equinix Europe Limited or one of its associated/subsidiary companies. This email, and any files transmitted with it, contains information which is confidential, may be legally privileged and is solely for the use of the intended recipient. If you have received this email in error, please notify the sender and delete this email immediately.  Equinix Europe Limited. Registered Office: Quadrant House, Floor 6, 17 Thomas More Street, Thomas More Square, London E1W 1YW. Registered in England and Wales No. 6293383.