[Kea-users] FW: Subnet mask selection

[kea at jack.fr.eu.org]

Hi,

Thanks for the answer,

We such configuration, any host reservation for subnet_id 1002 will get
a "failed to allocate an IPv4 address after 0 attempt(s)"

Here the configuration:
"interfaces-config": {
    "dhcp-socket-type": "raw",
    "interfaces": [
        "*"
    ]
},
"subnet4": [
    {
        "id": 1024,
        "subnet": "10.0.0.0/24"
    },
    {
        "id": 1025,
        "subnet": "12.0.0.0/25"
    }
],

My host reservation from SQL:
MariaDB [kea]> select dhcp4_subnet_id from hosts where dhcp_identifier =
unhex('aa0000f14782');
+-----------------+
| dhcp4_subnet_id |
+-----------------+
|            1024 |
+-----------------+

This works.

If I swap the host reservation:
MariaDB [kea]> select dhcp4_subnet_id from hosts where dhcp_identifier =
unhex('aa0000f14782');
+-----------------+
| dhcp4_subnet_id |
+-----------------+
|            1025 |
+-----------------+

2017-05-26 10:01:42.654 WARN  [kea-dhcp4.alloc-engine/15173]
ALLOC_ENGINE_V4_ALLOC_FAIL [hwtype=1 aa:00:00:f1:47:82], cid=[no info],
tid=0xc08be943: failed to allocate an IPv4 address after 0 attempt(s)

Best regards,
Jack

On 23/05/2017 22:02, Wessel, Sebastian wrote:
> Hi (what is your name?),
> 
> i'm wondering why you are writing your interface to each of the subnets.
> Where did you get that configuration from?
> 
> In our config file the interface is defined once at the beginning like this:
> 
>     "interfaces-config" :
>     {
>       "dhcp-socket-type" : "udp",
>       "interfaces" :
>       [
>         "ens160"
>       ]
>     },
> 
> See http://kea.isc.org/docs/kea-guide.html#dhcp4-interface-configuration
> (the udp is because of the relayed traffic)
> 
> The subnets look like this:
> 
>     "subnet4" :
>     [
>       {
>         "subnet": "10.1.0.0/28",
>         "id"    : 1001,
>         "option-data": [ { "name": "routers", "data": "10.0.0.1" } ],
>         "pools" : [ { "pool" : "10.1.0.2 - 10.1.0.10" } ]
>       },
>       {
>         "subnet": "10.2.0.0/28",
>         "id"    : 1002,
>         "option-data": [ { "name": "routers", "data": "10.2.0.1" } ],
>         "pools" : [ { "pool" : "10.2.0.2 - 10.2.0.10" } ]
>       },
> 
> So there is no need to set the subnet mask.
> 
> 
> 
> 
> 
> 
> 
> Mit freundlichen Grüßen / With kind regards
> 
> Sebastian Wessel
> Specialist IT Systems
> _________________________________________________________________________________________________________________________
> 
> Sebastian Wessel
> Takko Holding GmbH
> Alfred-Krupp-Straße 21, 48291 Telgte, Germany
> Phone +49 2504 923 865 Mobile +49 152 21811579 Fax +49 2504 923 797
> www.takko.com
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> Ust.-Id. Nr. DE209094382-----Original Message-----
> From: Kea-users [mailto:kea-users-bounces at lists.isc.org] On Behalf Of kea at jack.fr.eu.org
> Sent: Tuesday, May 23, 2017 2:00 PM
> To: kea-users at lists.isc.org
> Subject: [Kea-users] Subnet mask selection
> 
> Hi,
> 
> tl;dr: can I set option 1 (subnet mask) on a per-host basis ?
> 
> I am using Kea dhcp4 1.1.0
> I have the following setup:
> - a single interface (eth0)
> - clients are directly connected (no relay)
> - two subnets (a /24, a /25), each defined with a specific subnet_id :
> {'id': 1024, 'subnet': '10.0.0.0/24'} and {'id': 1025, 'subnet':
> 10.1.0.0/25'}
> - a sql database which contains, for all trusted hosts, the allocated IP address, the corresponding subnet_id, and an option 3 (routers)
> 
> 
> Sadly, as-is, I cannot make it works
> If a bind each subnet to the interface eth0, it works for the first defined subnet, not for the other Config sample:
> {
>     "id": 1024,
>     "interface": "eth0",
>     "subnet": "10.0.0.0/24"
> },
> {
>     "id": 1025,
>     "interface": "eth0",
>     "subnet": "10.1.0.0/25"
> }
> 
> -> OK for hosts in 1024, "failed to advertise a lease" for hosts in 1025
> 
> If I remove the interface binding, same behavior:
> -> OK for hosts in 1024, "failed to advertise a lease" for hosts in 1025
> 
> If I put all hosts in 1024, and add an option 1 (subnet mask) in the configuration, or inside the sql database : all host gets a /24 (aka, option 1 is ignored)
> 
> Is there a way to solve my case ?
> 
> Best regards,
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