[Kea-users] KEA DHCPv6 subnet prefixes from upstream IA_PD

[Darren Ankney]

Hi Owen,

I can't think of anyway from within Kea to do this.  Kea would have no
knowledge of what prefix was delegated.  I would say that you would
need to do scripts or find some consumer device that already does this
for you (e.g., perhaps one of the ASUS routers?).

Thank you,
Darren Ankney

On Tue, Jan 14, 2025 at 4:33 AM Owen DeLong via Kea-users
<kea-users at lists.isc.org> wrote:
>
> I’ve got a router running on a linux box using IPv4 NAT, and the KEA dhcp4 configuration is limited, but simple because my only option is to assign static RFC-1918 subnets and NAT them.
>
> However, for IPv6, I’m receiving an IA_PD and I’m able to use systemd-networkd to put the prefixes on the interfaces, but I’m stumped how to get KEA to pick up those prefixes to build DHCPv6 pools for address assignment. Sadly, I’ve got a few devices that won’t do SLAAC (yes, I know this is sacrilege, but I lack leverage to move the vendors in question). My clients that speak SLAAC are getting valid information and working.
>
> However, I’d like to provide M+O bits and do some reservations and stateful DHCPv6 in some cases. However, I don’t want to have to go in and edit the kea-dhcp6.conf every time the upstream decides to change the delegated prefix, so I’m trying to avoid hardcoding a dynamic prefix into the kea configuration file.
>
> Is there currently any way to do this in KEA? I suppose worst case, I can write scripts to update the kea configuration and put them in systemd-networkd hooks so that when the prefix is changed, they update kea, but that feels horribly hacky and I can’t help but think this would be a common implementation situation in the SOHO world.
>
> Any pointers or assistance greatly appreciated. If the question is asked and answered, links are appreciated as I haven’t found the answer in any of my searching so far.
>
> Thanks,
>
> Owen
>
> --
> ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information.
>
> To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
>
> Kea-users mailing list
> Kea-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/kea-users