[Kea-users] option 43 coming back blank

[Darren Ankney]

Hi Alan,

I believe i see the problem.  There is nothing here to instruct Kea to
include the CALIXGC space in option 43.  You should use the
"vendor-encapsulated-options-space" which Kea is expecting to
encapsulate in "vendor-encapsulated-options".  See
https://kea.readthedocs.io/en/kea-2.2.0/arm/dhcp4-srv.html#dhcpv4-vendor-specific-options
for details.  If you want to leave a note for yourself what it is for,
have a look at https://kea.readthedocs.io/en/kea-2.2.0/arm/config.html#user-context
which describes how you can leave comments in the JSON that are valid
JSON and also ignored by Kea.

Thank you,

Darren Ankney

On Fri, Apr 14, 2023 at 7:44 PM Alan Batie <alan at peak.org> wrote:
>
> I'm trying to migrate from isc-dhcp to kea, however the option 43
> responses are coming back blank (they are actually getting sent, just
> with an empty value field):
>
> 2023-04-14 16:31:37.551 DEBUG [kea-dhcp4.packets/17503.140114709323392]
> DHCP4_RESPONSE_DATA [hwtype=1 48:77:46:f9:5b:b0], cid=[no info],
> tid=0x830e4d5b: responding with packet DHCPACK (type 5), packet details:
> local_address=207.55.16.91:67, remote_address=207.55.34.22:68,
> msg_type=DHCPACK (5), transid=0x830e4d5b,
> options:
>    type=001, len=004: 4294967280 (uint32)
>    type=003, len=004: 207.55.34.17
>    type=006, len=008: 69.59.192.61 69.59.192.62
>    type=012, len=006: "router" (string)
>    type=028, len=004: 207.55.34.31 (ipv4-address)
>    type=043, len=000:
>    type=051, len=004: 300 (uint32)
>    type=053, len=001: 5 (uint8)
>    type=054, len=004: 207.55.16.91
>    type=082, len=097:,
>
>
> isc relevant config:
>
> global:
>    option space CALIXGC;
>    option CALIXGC.acs-url code 1 = text;
>
> subnet:
>    set vendor-string = option vendor-class-identifier;
>    vendor-option-space CALIXGC;
>    option CALIXGC.acs-url "<some url>";
>
>
>
> kea relevant config:
>
> {
>    "Dhcp4": {
>        "option-def": [
>        {
>          "space": "CALIXGC",
>          "name": "acs-url",
>          "code": 1,
>          "type": "string"
>        }
>      ],
>      "subnet4": [
>        {
>          "option-data": [
>            {
>              "name": "vendor-encapsulated-options",
>              "code": 43
>           },
>           {
>             "space": "CALIXGC",
>              "name": "acs-url",
>              "code": 1,
>              "data": "<some url>"
>            }
>         ]
>        }
>      ]
>    }
> }
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