[Kea-users] Testing option 43

[Darren Ankney]

Hi Kraishak,

Have a look here:
https://kea.readthedocs.io/en/kea-2.2.0/arm/dhcp4-srv.html?highlight=%22vendor-encapsulated-options%22#dhcpv4-vendor-specific-options

You might need to setup encapsulated sub-options and tell Kea to
include the "vendor-encapsulated-options-space" content in the options
as a sub-option:

 "option-data": [
   {
     "name": "REPLACE_ME",
     "space": "vendor-encapsulated-options",
     "code": 1,
     "csv-format": false,
     "data": "74657374"
   },
    {
       "name": "vendor-encapsulated-options"
      }
  ]

So, above, first the data is added as a sub-option of option 43
(option 43 typically consists of one or more sub-options).  Replace
"REPLACE_ME" with the name of the sub-option you are trying to send (I
think you can omit name entirely if there is none as that part isn't
sent).  Set the code to the correct sub-option number.  If this
particular data should not be a sub-option, then you might have to do
something like this:

        {
                     "code": "43",
                    "csv-format": true,
                    "data": "74657374",
               },

please note that if "csv-format" is set to false, then Kea will be
expecting "a hexadecimal string." see:
https://kea.readthedocs.io/en/kea-2.2.0/arm/dhcp4-srv.html?highlight=%22csv-format%22#standard-dhcpv4-options

Can you share the option 43 portion of the ISC DHCP configuration you
are trying to convert if you still have trouble?

Thank you,

Darren Ankney

On Mon, Jun 12, 2023 at 1:59 PM Kraishak Mahtha <kraishak.edu at gmail.com> wrote:
>
> Hi,
> I am trying to convert my ISC config to kea-equivalent and testing the changes as part of the testing, I am stuck at testing option 43 ,
> Using the keama tool I convert my ISC config to Kea equivalent config and tested the leases but in the DHCP ACK packet I cannot see option 43 coming when I operate with Kea
>
> sample code config for option 43 that I used in my testing subnet
>            {
>                     "data": "74657374",
>                     "name": "vendor-encapsulated-options",
>                     "csv-format": false
>                 },
>
> But in log and tcpdump I see the empty value for option 43
>
> Log:
> ===
> 2023-06-12 15:10:26.284 DEBUG [kea-dhcp4.packets/30590.140464453838592] DHCP4_RESPONSE_DATA [hwtype=1 21:21:2f:00:00:01], cid=[01:21:21:2f:00:00:01]x8259145: responding with packet DHCPACK (type 5), packet details: local_address=192.168.0.125:67, remote_address=4.0.0.1:67, msg_type=DHCPACK (5), =0x8259145,
> options:
>   type=001, len=004: 4294901760 (uint32)
>   type=003, len=004: 4.0.0.1
>   type=006, len=012: 6.6.6.6 7.7.7.7 8.8.8.4
>   type=012, len=018: "dhcp-client-000001" (string)
>   type=015, len=011: "test.com" (string)
>   type=043, len=000:  ----->Empty Value, and I cross-verified the tcpdump too.
>   type=051, len=004: 86400 (uint32)
>   type=053, len=001: 5 (uint8)
>   type=054, len=004: 192.168.0.125
>   type=061, len=007: 01:21:21:2f:00:00:01
>
> I have checked the discover packet option 55 just to make sure if my packet is asking for option 43 or not, and yes I can see option 43 in the option 55 parameter value.
>
> I am not sure what is wrong I am doing, Can someone who has familiar can guide me
>
> Thanks in Advance
> Kraishak
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