[Kea-users] IA_PD without IA_NA and reserved Prefixes
Wido den Hollander
wido at widodh.nl
Wed Apr 20 18:07:34 UTC 2016
> Op 20 apr. 2016 om 19:17 heeft Marcin Siodelski <marcin at isc.org> het volgende geschreven:
>
>
>
>> On 20.04.2016 07:39, Wido den Hollander wrote:
>>
>>> Op 20 april 2016 om 16:06 schreef Wido den Hollander <wido at widodh.nl>:
>>>
>>>
>>> Hello,
>>>
>>> My use-case is where I want to run a DHCPv6 server which does IA_PD, but
>>> doesn't
>>> do IA_NA.
>>>
>>> The clients in this case obtain their address through SLAAC and additionally
>>> can
>>> get a prefix through IA_PD.
>>>
>>> Additionally I only want assigned prefixes to be allowed. Only if a
>>> reservation
>>> is present I want to hand it out. Otherwise no prefix is assigned. That part
>>> seems to work by using the 'out-of-pool' mode for reservations.
>>>
>>> In Kea I can't get this configured since it always requires a subnet.
>>>
>>> "subnet6": [
>>> {
>>> "subnet": null,
>>> "interface-id": "VLAN709",
>>> "reservation-mode": "out-of-pool",
>>> "reservations": [
>>> {
>>>
>>> This doesn't work, the same as leaving 'subnet' out of the configuration.
>>>
>>> Is this possible with Kea?
>>
>> I actually found out that this already works. Just define a 'subnet', but do not
>> define a 'pool' inside the subnet6 section.
>>
>> My clients are now able to obtain a prefix through IA_PD but never get a answer
>> for IA_NA:
>>
>> [kea-dhcp6.alloc-engine/1856] ALLOC_ENGINE_V6_ALLOC_FAIL
>> duid=[00:01:00:01:1e:94:17:e8:06:d4:36:00:04:87], tid=0x189a81: failed to
>> allocate an IPv6 address after 0 attempt(s)
>>
>> Wido
>
> Hi Wido,
>
> From your second email it sounds that you were able to configure Kea to
> do what you want. Do you need any more assistance on this?
>
Yes, it works now. However, it would be nice if you could omit the subnet in the configuration.
This way Kea knows you only use it for IA_PD and will not respond on IA_NA.
Wido
> Marcin Siodelski
> ISC
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