[Kea-users] leasequery and PD reservations

[Torbjörn Eklöv]

I can confirm that it’s working with remote-id with this setup. One /56 is delegated / remote-id.

"mac-sources": [ "remote-id" ],
.
.
.

    "subnet6": [ {
                "subnet": ”2001:db8:0020::/48",
                "pd-pools": [ { "prefix": ”2001:db8:0020::", "prefix-len": 48,"delegated-len": 56 } ],
        "reservations":  [
                { "hw-address": "02:00:21:00:0D:AF:00:0A:00:03:00:01:00:1F:6C:D1:DB:81", "prefixes": [ ”2001:db8:20:0100::/56" ] },
                { "hw-address": "02:00:22:00:0D:AF:00:0A:00:03:00:01:00:1F:6C:D1:DB:81", "prefixes": [ ”2001:db8:20:0200::/56" ] },
                { "hw-address": "02:00:23:00:0D:AF:00:0A:00:03:00:01:00:1F:6C:D1:DB:81", "prefixes": [ ”2001:db8:20:0300::/56" ] },
                { "hw-address": "02:00:24:00:0D:AF:00:0A:00:03:00:01:00:1F:6C:D1:DB:81", "prefixes": [ ”2001:db8:20:0400::/56" ] }
                ]

              }

           ],




> 15 feb. 2017 kl. 17:07 skrev Tomek Mrugalski <tomasz at isc.org>:
> 
> W dniu 15.02.2017 o 15:37, Torbjörn Eklöv pisze:
>> Thanks. I get remote-id and client-id in the log now but there are more issues that prevents me from using it in production.
>> I miss this now:
> Ahhh, new requirements.
> 
>> - leasequery
> We don't have this planned. It's not a frequently requested feature by
> any means. It's unlikely leasequery would be implemented in a near
> future, unless there are people who are willing to step up and fund its
> development.
> 
> Also, there are now 3 types of leasequery protocols defined right now. I
> presume you're talking about the "basic" one, right?
> 
> For completeness, here are the RFCs that define them:
> 
> 1. RFC5007 - DHCPv6 Leasequery (requestor asks about specific address or
> about specific identifier and gets one reply, works over UDP)
> 
> 2. RFC5460 - DHCPv6 Bulk Leasequery (requestor can get many responses,
> e.g. give me all clients that connected through relay X, works over TCP)
> 
> 3. RFC7653 - DHCPv6 Active Leasequery (requestor subscribes to the
> server, and then the server sends any lease updates as soon as they
> happen, works over TCP or TLS)
> 
>> - lease database where I assign PD prefix depended on client-id and remote-id
> I recall similar request was discussed previously, but I reviewed my
> mail archive and can't find it. Anyway, here it is:
> 
> Reservations are stored in a separate table, so they're not exactly the
> same as "lease database". Those can be kept in MySQL, PostgreSQL or in
> the config file. (There's also an unreviewed patch for Cassandra, but I
> would recommend against doing anything with it in production).
> 
> For any given client, do you need both client-id and remote-id? If yes,
> that's not supported. If you can do a reservation by client-id OR
> remote-id, there is something you can try. PD can be reserved for
> client-id (use "duid" keyword). PD can also be reserved for specific
> hardware address (use "hw-address" keyword) and configure your MAC
> source to use treat content of remote-id as MAC.
> See Section 8.3
> (https://jenkins.isc.org/job/Kea_doc/guide/kea-guide.html#host-reservation-v6)
> and Section 8.9
> (https://jenkins.isc.org/job/Kea_doc/guide/kea-guide.html#mac-in-dhcpv6).
> 
> Implementing more reservation types is one of the strong candidate
> features for upcoming 1.3. However, the decision hasn't been made yet.
> Mid to late March sees to be the timeframe to scope features for 1.3.
> 
>> Does anyone on this list know a product that can do what I want? ISC DHCP and Dibbler don’t
> Forget about Dibbler. It was a hobby project I did over weekends, but it
> isn't maintained. I did that for 13 years, but I simply don't have time
> for that any more.
> 
> Depending if the hw-address+mac-sources trick works for you, you may be
> missing leasequery only. Or perhaps leasequery and the reservation stuff
> if the trick doesn't cover your case. One of the things we consider for
> 1.3 is a generic reservation mechanism. You'd define an expression in a
> way similar to client classification and use values of that expression
> in your reservations.
> 
> It seems the biggest problem here is leasequery. So how badly do you
> need it?
> 
> Tomek




Torbjörn Eklöv | Interlan Gefle AB
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