Re: IPv6 broadband provisioning

[Gert Doering <gert@space.net>]

Hi,

On Fri, Dec 28, 2007 at 01:58:27PM +0100, Iljitsch van Beijnum wrote:
> The first device under the control of the ISP, or at least a device  
> very low in the aggregation hierarchy, to intercepts router  
> advertisements from the ISP's IPv6 router and slightly modifies them:  
> it basically injects some bits that are particular to the customer/ 
> line, so that every customer sees RAs with a prefix unique to them.

I see your proposal as a solution to the problem space "multiple customers
share a single layer 3 segment".

In our network, this is basically a non-problem - every customer has their
own routed layer 3 segment, gets their own /48 (or /56), and the ingress 
router will do proper IPv6 uRPF (eventually).

We are not a cable modem operator (where a large and shared broadcast domain 
is unavoidable), but as far as I understand, for those networks the cable 
modem is always provided and provisioned by the operator?  If yes, they 
shouldn't have a problem here either.

Another problem area might be large-scale DSL where customers are not
terminated by PPPoE/L2TP, but sort of "all of them bridged together" - here
your approach might make sense.  But then - if you have a device that 
needs to understand enough IPv6 to modify RAs and filter incoming packets
accordingly, why not move IPv6 routing functionality all the way to that
device, and go back to the "one customer, one L3 segment" model?

Gert Doering
        -- NetMaster
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