DHCPv6 PD & Routing Questions

Brett Frankenberger rbf+nanog at panix.com
Sun Dec 6 23:03:47 UTC 2015

On Sun, Dec 06, 2015 at 02:20:36PM -0800, Owen DeLong wrote:
> As an alternative worth considering, it could do this with BGP instead of OSPF.
> There’s nothing mythical or magical about BGP. A CPE autoconfiguring
> itself to advertise the prefix(es) it has received from upstream
> DHCPv6 server(s) to it’s neighbors is not rocket science. In fact,
> this would mean that the CPE could also accept a default route via
> the same BGP session and it could even be used to enable automatic
> failover for mulihomed dynamically addressed sites.
> Sure, this requires modifying the CPE, but not in a particularly huge
> way and it provides a much cleaner and more scaleable solution for
> the ISP side of the equation than OSPF.
> Most current implementations use RIPv2, but we all know just how icky
> that is.

How do you secure that?  Or do you just assume no one will announce
someone else's prefix?  (I can think of ways to secure it, of course,
but none of the approaches for having the DHCP server configure some
sort of prefix access control seem to me to be any better or easier
than having the DCHP server configure a static route).

This isn't a problem I face, but if it were, I think I'd solve it by
having the DHCP server inject the route via BGP with an appropriate

     -- Brett

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