using "reserved" IPv6 space

Sun Jul 15 10:13:59 UTC 2012

On Jul 15, 2012, at 12:50 AM, Laurent GUERBY wrote:

> Hi,
> 
> On Sat, 2012-07-14 at 17:02 -0700, Owen DeLong wrote:
>>> Hi,
>>> 
>>> We use LLA to "virtualize" interconnection to our users:
>>> their network configuration is always static default via fe80::nnnn
>>> and we route their /56 prefix to fe80::xxxx:yyyy where xxxx:yyyy is
>>> unique per user - if our user want to do some routing of course.  Since
>>> we don't have GUA interconnections we don't have to manage them inside
>>> our AS and we can move user stuff around without having them changing
>>> anything to their static configuration.
>>> 
>>> We give a /56 IPv6 per /32 IPv4 to our user which does /48 = /24 = 256
>>> "IP", it's nice to have more than one /64 around for some uses.
>>> 
>>> Is there any "mass" hoster around that does provide by default a pefix
>>> larger than /64 and that does route it to the user? It's quite simple to
>>> do in IPv6 and we have the address space for it.
> 
>> Why not just give each end-site a /48?
> 
> We give a /48 on request, a /56 by default (and we never give a /64).
> 
>> An end-site with a /24 may only need a single or a few subnets while an end-site with a /32 may have a host of subnets behind their IPv4 NAT gateway. Making IPv6 topological assumptions for your end-users based on their IPv4 presentation makes little sense to me and is likely a disservice to your end users.
> 
> The /56 subnets we give are for single machine in a rack, virtual
> machine in a cluster or home router.
> 
> http://www.tunnelbroker.net/ gives by default /64 to a home router
> and /48 on request we just decided to give /56 by default
> and /48 on request.
> 
> Sorry if I wasn't clear in my first message.
> 
> Is there an agreed upon definition of "end site"?
> 

Not exactly, but, there is now an ARIN definition for ARIN address policy.

An end site (IIRC since I wrote the ARIN definition) is a single building or structure or a single tenant in a multi-tenant building or structure.

So, if you have a university campus with 23 buildings, that might be 23 end sites. However, if one of them is a dormitory which has 100 rental units, that would up the end-site count to 122. If one of those buildings houses the math department, the physics department, and the science department, that might bring the total up as high as 124.

Make sense?

Owen