[Kea-users] One PD pool for multiple subnets

[Torbjörn Eklöv]

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<mailto: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<mailto:blazej.krajnak at gmail.com>>
To: "kea-users" <kea-users at lists.isc.org<mailto: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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