[Kea-users] About Stateless DHCPv6 settings.

[Yoshihito Horigome]

Hello Tomek,

Sorry for the late reply.
> Hold on. That doesn't look like stateless at all. You didn't provide
> full logs, but I guess your device must have sent SOLICIT, so Kea
> reponds with ADVERTISE.
>

> This looks like misunderstanding what stateless really is.
> You may also take a look at
> https://tools.ietf.org/html/rfc8415#section-6.1 or now obsoleted RFC3736.
>

Thank you for the information.
My understanding of DHCPv6 seems to be lacking.

I would like to set kea after studying again.
Best regards.

On 8月 28 2019, at 7:14 午前, Tomek Mrugalski <tomasz at isc.org> wrote:
> On 27.08.2019 14:16, Yoshihito Horigome wrote:
> > I am trying to configure stateless DHCPv6 with reference to the
> > documentation[1].
> >
> > When set, "Sorry, no prefixes could be allocated." Is output, and a
> > message indicating that allocation is not possible is output.
>
>
> > 2019-08-26 20:40:39.271 DEBUG [kea-dhcp6.packets/35] DHCP6_PACKET_SEND
> > duid=[00:03:00:01:6c:3b:6b:cf:9b:94], tid=0xcab890: trying to send
> > packet ADVERTISE (type 2) from [ff02::1:2]:547 to
> > [fe80::8e3b:6bff:fecf:9b94]:546 on interface eth0
> > 2019-08-26 20:40:39.272 DEBUG [kea-dhcp6.packets/35] DHCP6_RESPONSE_DATA
> > responding with packet type 2 data is localAddr=[ff02::1:2]:547
> > remoteAddr=[fe80::8e3b:6bff:fecf:9b94]:546
> > msgtype=2(ADVERTISE), transid=0xcab890
>
>
> Hold on. That doesn't look like stateless at all. You didn't provide
> full logs, but I guess your device must have sent SOLICIT, so Kea
> reponds with ADVERTISE.
>
> Stateless DHCPv6 is a simplified mode that does not involve assigning
> anything (addresses or prefixes) that requires state tracking. Hence the
> name stateless. It is used to provide additional configuration options,
> such as DNS addresses or domain names. That kind of information is
> requested by client sending INFORMATION-REQUEST message and the server
> is supposed to reply with REPLY message.
>
> The protocol spec says that if you need any addresses or prefixes, you
> are doing stateful and therefore must send SOLICIT rather than INF-REQUEST.
>
> So, if you want an address or prefix assigned, stateless is not for you.
> Alternatively, if you want to use stateless, your device should not
> request addresses or prefixes and send INF-REQUEST without any IA_NA or
> IA_PD options (both are forbidden in INF-REQUEST).
>
> > With statefull DHCPv6, it was possible to assign addresses to client PCs.
> > Is there something wrong with the settings?
>
> This looks like misunderstanding what stateless really is.
>
> You may also take a look at
> https://tools.ietf.org/html/rfc8415#section-6.1 or now obsoleted RFC3736.
>
> Tomek
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> Kea-users mailing list
> Kea-users at lists.isc.org
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>

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