ISP customer assignments

Tue Oct 13 20:01:14 UTC 2009

On Oct 13, 2009, at 9:56 PM, Joe Abley wrote:

>
> On 2009-10-13, at 14:46, Matthew Petach wrote:
>
>> I allocate a /64, but currently I configure only a /127 subnet on the
>> actual interface.
>
> For BRAS/PPPoE deployments you're dealing with a point-to-point  
> link, so in principle you can number the endpoints using whatever  
> you want. They're just host addresses and interface routes when it  
> comes down to it. There's no need to number both ends within a  
> single conventional subnet.
>
> In the test deployment I did earlier in the year I defined a pool of  
> link addresses per BRAS (one /64 prefix per BRAS) and handed out one  
> to each subscriber using ND/RA after IPv6CP had completed. To the  
> subscriber that looked like a /128 host route, with some other  
> arbitrary address on the far side. (We could have done it with  
> RADIUS too, but having a static link address didn't seem  
> particularly important.)
>
> A sub-side static /48 was then assigned via RADIUS and a route  
> installed on the BRAS side, with DHCPv6 PD available as an option  
> for clients who want auto-configuration rather than static config.
>
> It seemed to work. BRAS was a Juniper E-series (test box was an  
> ERX310).

We run roughly the same, although we skip the whole globalscope  
address on the PPP, running localscope only works for the CPE we  
tested so far.

MarcoH