DHCPv6 PD & Routing Questions

Mon Nov 23 22:39:54 UTC 2015

In message <6B49EE17-6DE1-4493-91C1-478F3BA44F12 at delong.com>, Owen DeLong write
s:
>
> > On Nov 23, 2015, at 12:27 , Mark Andrews <marka at isc.org> wrote:
> >
> >
> > In message <29055E3F-B923-4E21-8513-60CC8C14A6C9 at delong.com>, Owen
> DeLong writes:
> >>
> >>> On Nov 23, 2015, at 00:53 , Tarko Tikan <tarko at lanparty.ee> wrote:
> >>>
> >>> hey,
> >>>
> >>>> So I'd say there is equipment out there that works, as expected, but
> as
> >>>> seen in this thread, plenty of equipment that doesn't.
> >>>
> >>> Latest OpenWrt releases include https://github.com/sbyx/odhcpd as
> >> DHCPv4/6 server. This enables hierarchical PD on these platforms, ie.
> >> subdelegate /64s from the /56 PD prefix you received from SP.
> >>>
> >>> It's not the most configurable thing at this point but it does the
> job.
> >>
> >> If your SP is giving you a /56, you should complain and ask for a
> proper
> >> /48.
> >>
> >> Especially if youâ€™re doing any real hierarchical PD.
> >>
> >> Owen
> >
> > Or you just don't do heirarchial routing / PD inside the site.  It
> isn't needed.
> > 65000 intra site routes isn't that hard handle nor is 65000 PD's for
> the border
> > routers.
>
> Yes, but to get to 65000 intrasite routes, youâ€™ve got to already have
> that /48 I was
> suggesting you ask for.
>
> Owen

And a /56 gives you 256 subnets.  When you remove unnecessary
heirachical delegation / routing that still supports a reasonable
sized home network.

A /48 would be better but getting the allocation working is the
first step.  It's easy enough to make a /48 not work if you insist
on heirachical delegation.

Mark
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org