[Kea-users] need to use circuit-id in option

Mon Mar 10 10:09:35 UTC 2025

Hi Darren,

First result is not successfull 🙂

I see in the wireshark that there is no concat done.. So perhaps the syntax applied is not correct.

Will do some more testing..

________________________________
From: Kea-users <kea-users-bounces at lists.isc.org> on behalf of DDFR | Ronald Blaas <ronald.blaas at ddfr.nl>
Sent: Monday, March 10, 2025 08:33
To: Kea user's list <kea-users at lists.isc.org>
Subject: Re: [Kea-users] need to use circuit-id in option

Hi Darren,

Yes I have read about concat but was unsure how to apply it.

I will try your example 🙂

Will let you know if that worked 🙂

regards

Ronald

________________________________
From: Kea-users <kea-users-bounces at lists.isc.org> on behalf of Darren Ankney <darren.ankney at gmail.com>
Sent: Friday, March 7, 2025 19:07
To: Kea user's list <kea-users at lists.isc.org>
Subject: Re: [Kea-users] need to use circuit-id in option

Hi Ronald,

I am uncertain if this can be used in the data field, but there is a
concat() in Kea:
https://eur05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fkea.readthedocs.io%2Fen%2Fkea-2.6.1%2Farm%2Fclassify.html%23concat&data=05%7C02%7Cronald.blaas%40ddfr.nl%7Caacb4ce9967d49dfc54408dd5da2fcc8%7C61b60fb772d74ba78225d9b5369d780a%7C0%7C0%7C638769676795020090%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=D6m6LQrkyRqy%2Fo1vVHtC8p9702UkrbJb0l5QYzECymc%3D&reserved=0<https://kea.readthedocs.io/en/kea-2.6.1/arm/classify.html#concat>

You can use a '+' sign as a shortcut so you might be able to do something like:

"data": "'s=xx.xx.xx.xxc='+option[82].option[1].hex"

but I've never tried to use these functions or packet contents in the
"data" field.

Thank you,
Darren Ankney

On Wed, Mar 5, 2025 at 4:04 AM DDFR | Ronald Blaas <ronald.blaas at ddfr.nl> wrote:
>
> Hi all,
>
> We recently switch a subnet from isc-dhcp to isc-kea
>
> There is one thing where I am unable to succeed.
>
> We need to sent some options to a device but ISC-DHCP is using concat and I am unsure how to apply this is kea
>
> This is the relevant part:
>
> If substring (option host-name, 0, 6) = "geneos" {
>         option genexis.gaps = concat("s=xx.xx.xx.xx;c=", option agent.circuit-id);
>
>
> What I have so far is:
>
>
>       {
>
>                     "name": "gaps",
>                     "space": "vendor-25167",
>                     "data": "s=xx.xx.xx.xx",
>                     "always-send": true
>               }
>
>
> I could use some help getting the circuit id in the data field.
>
>
> Kind regards
>
>
> Ronald
>
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