Re: [v6ops] Updating RFC 7084

[Ted Lemon <[e-mail]>]

A CE router is a router that is at the customer edge of the network. It
might be managed by the ISP, but often isn’t. If you buy a WiFi router from
Amazon, you are buying a CE router. If it supports IPv6, as most do, then
it definitely will request at least a /64 from whatever it’s connected to.

Op vr 18 nov. 2022 om 10:23 schreef Alexandre Petrescu <
[e-mail]>

> Ted,
>
> Le 18/11/2022 à 16:13, Ted Lemon a écrit :
> > Pretty much any CE router should ask for a /48,
>
> My question is not about a CE (customer edge) router, presumably
> connected on the DSL or optical line.
>
> I am asking aboout a trivial off-the-shelf access point router, or some
> other such router like a tv router, or a printer router, or any box
> router?  This router would not be the CE, would not be managed by the ISP.
>
> I am trying to understand whether any such off-the-shelf box made for
> home networks runs DHCPv6-PD clients at all.
>
> > 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.
>
> I think it makes sense for the CE router managed by the ISP to ask for a
> /48 from the ISP network, either with its own DHCPv6-PD client or with
> some other protocol means.
>
> > 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.
>
> I think the DHCP server on the CE router should allocate any prefix
> length on the LAN interface, not necessarily /64.
>
> The CE router could get a /48 on its DSL line, then form a /56 and
> allocate it to an in-home router on the LAN, which would further form a
> /57 and so on.  All with DHCPv6-PD.
>
>   In this
> > way, if the end user plugs a bunch of networks together, the edge
> > router winds up being responsible for all sub-delegations.
>
> Fair enough.
>
> >
> > 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.
>
> True.  There are countless opportunities for this loop.  But these
> opportunities are there anyways, regardless of the DHCPv6-PD presence.
> With a NAT everywhere concept too it is possible to create difficult
> loops, briges-vs-router impossible behaviours and so on, especially when
> there are too numerous brands of devices in that home network.
>
> Alex
>
> >
> > On Fri, Nov 18, 2022 at 10:01 AM Alexandre Petrescu
> > <[e-mail] <mailto:[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/>
> >> <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
> >>
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