[Kea-users] One PD pool for multiple subnets

[Blažej Krajňák]

Until now I planned per site:
- /56 for last-mile links (/64) to customers CPEs
- /40 for PD

It looks I have to break it to /48 per VLAN and site for PD. I really
don't see any other option.

Just to explain clearly: for me, a VLAN is one sector antenna or one
PON port (1:128 splitting). So 256x /56 subnets is enough.

There is still an option to announce only sumarized /40 to IGP, that's
not problem.

st 8. 6. 2022 o 16:45 Torbjörn Eklöv via Kea-users
<kea-users at lists.isc.org> napísal(a):
>
> You can use multiple subnets in any way you wan’t with DHCPv6 PD. If it’s correct way to do it it’s up to you but I shouldn’t use my example below
>
> kea-dhcp6.conf
> .
> .
> "subnet6": [
> {
>     "subnet": "2001:db8:0001::/48",
>     "pd-pools": [ { "prefix": "2001:db8:8000::", "prefix-len": 36,"delegated-len": 56 } ]
> }
> .
> ,
>
> If the DHCPv6 relay adress is included in the 2001:db8:0001::/48 subnet the kea-dhcp6 will happily assign one /56 from the 2001:db8:8000::/36 subnet. ( Over one miljon /56 )
> Then you will have a massive numbers of internal /56 routes.
>
> I should instead do ~like this
>
> "subnet6": [
> {
>     "subnet": "2001:db8:0002::/120",
>     "pd-pools": [ { "prefix": "2001:db8:8000::", "prefix-len": 40,"delegated-len": 56 } ]
> }
>
> And only announce the /40 from “one site router” to the IGP.
>
> Torbjörn Eklöv | Interlan Gefle AB
> Marielundsvägen 2, 803 22 GÄVLE
> Växel: 026-18 50 00 | Direkt: 070-683 51 75
> http://www.dnssecandipv6.se
>
> "A home without IPv6 is just a house"
>
> On 8 Jun 2022, at 15:06, perl-list <perl-list at network1.net> wrote:
>
> as far as I understand, that isn't possible.  It probably should be given the way prefix delegation works, but that wasn't how they chose to design it (at least the way I understand it).  Each prefix must be part of a particular subnet which can all be grouped together under a single shared network but that also shares the subnets between the sites.
>
> ----- Original Message -----
>
> From: "Blažej Krajňák" <blazej.krajnak at gmail.com>
> To: "kea-users" <kea-users at lists.isc.org>
> Sent: Wednesday, June 8, 2022 8:43:26 AM
> Subject: [Kea-users] One PD pool for multiple subnets
>
>
> Hello,
>
>
> in our ISP network setup we need to use one PD pool for multiple
> subnets (this PD pool belongs to one site router which handles
> mulitple VLANs - subnets). Is it possible / what's the correct way to
> do that?
>
>
> Thanks,
> Blažej
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