[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



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