Re: [v6ops] Updating RFC 7084

[Ted Lemon <[e-mail]>]

Pretty much any CE router should ask for a /48, although I think a lot of
them don't. I don't think that the behavior currently specified in RFC7084
is quite right. I think what we want is for the CE router to always ask for
a /48. If it gets anything narrower than a /64, it sets up a DHCPv6 PD
server to sub-delegate. If it gets a /64, it sets up a relay agent and
relays any downstream PD requests to the DHCP server from which it got its
/64. If a prefix is delegated through the relay, it puts a route to that
prefix in its routing table, using the IP address of the DHCP client or
relay from which it received the PD request as its next-hop.

The DHCP server on the CE router only ever allocates /64s. In this way, if
the end user plugs a bunch of networks together, the edge router winds up
being responsible for all sub-delegations.

Of course, there's probably a way for this to all go very very wrong if the
end user creates a loop. I'm not sure how they'd do that, but it's probably
possible.

On Fri, Nov 18, 2022 at 10:01 AM Alexandre Petrescu <
[e-mail]> wrote:

>
>
> Le 18/11/2022 à 15:47, Timothy Winters a écrit :
> > Hello,
> >
> > I've started a draft to update RFC 7084 to support prefix delegation
> > on the LAN interfaces.  The current state of IPv6 in home networks is
> > ISP are assigning prefixes of appropriate sizes but they currently
> > are under utilized due to the lack of prefix delegation on LAN
> > interfaces.
> >
> > This draft is an attempt to add that support to the draft.
> >
> > https://datatracker.ietf.org/doc/draft-winters-v6ops-cpe-lan-pd/
> > <https://datatracker.ietf.org/doc/draft-winters-v6ops-cpe-lan-pd/>
> >
> > This is only an update to 7084 at the moment, there has been some
> > discussion on the snac working group about leveraging this work as
> > well.
> >
> > One item being discussed is this currently doesn't solve multi-homed
> >  networks.
> >
> > I welcome any feedback about the proposal.
>
> A general comment: my freebox would indeed take advantage of this
> proposal.  Currently the freebox relies on a grandma personnage to
> manually configure, and 'delegate' /64s to routers on LAN, out of a /56
> obtained on its DSL line.  She needs to add lines like this:
>
> IPaddress-of-in-home-router  prefix interface
>
> Were the freebox to implement a DHCPv6-PD server software, that work
> would be much easier, it would be automated.
>
> But, is there a wifi in-home access point, or some other such kind of
> in-home router, that would run a DHCPv6-PD Client to request the
> prefixes from a freebox?
>
> Alex
>
> >
> > ~Tim
> >
> > _______________________________________________ v6ops mailing list
> > [e-mail] https://www.ietf.org/mailman/listinfo/v6ops
>
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