ISP customer assignments

Joe Abley jabley at hopcount.ca
Tue Oct 13 14:56:22 CDT 2009


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).


Joe





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