[Kea-users] DHCPv4 - respond to option 108 without allocating leases

[Dan Oachs]

Yes, for option 108 to work and have an IPv6-mostly network, you need an
IPv4 pool available.  I believe Kea needs to temporarily allocate an IP
address for the DHCP request, then the client rejects or ignores it if the
client supports being on an IPv6 only network.  If the pool has no
addresses available, it can't respond appropriately.

Option 108, as far as I know, is not really meant to be used in an IPv6
only network.  It allows you to decrease your IPv4 usage for devices that
know they can live on an IPv6 only network, but other devices ( like
windows laptops ) won't use option 108 and will want an IPv4 address.

--Dan


On Wed, May 22, 2024 at 5:57 AM Francis Dupont <fdupont at isc.org> wrote:

> Looking the RFC 8925 to try to understand how it is supposed to work...
> I think you should add a pool and have the client to ignore the offered
> address (it is the only MUST in client and server behaviors which can make
> the feature to work). I leave further details to Tomek who is one of the
> authors...
>
> Regards
>
> Francis Dupont <fdupont at isc.org>
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