[Kea-users] Globally cut circuit id option

[perl-list]

disregard my previous message - wrong email list - was answering Kea list with the original DHCP configurations :)

----- Original Message -----
> From: "perl-list" <perl-list at network1.net>
> To: "kea-users" <kea-users at lists.isc.org>
> Sent: Wednesday, January 26, 2022 8:22:25 AM
> Subject: Re: [Kea-users] Globally cut circuit id option

> You can use substring to do that. Here is an example of it in use:

> match if substring (option dhcp-client-identifier, 1, 3) = "RAS";

> see also `man dhcp-eval`

> substring (data-expr, offset, length)

> The substring operator evaluates the data expression and returns the substring
> of the result of that evaluation that starts offset bytes from
> the beginning, continuing for length bytes. Offset and length are both numeric
> expressions. If data-expr, offset or length evaluate to
> null, then the result is also null. If offset is greater than or equal to the
> length of the evaluated data, then a zero-length data string
> is returned. If length is greater then the remaining length of the evaluated
> data after offset, then a data string containing all data from
> offset to the end of the evaluated data is returned.

> ----- Original Message -----
> > From: "egor grijuc" <egor.grijuc at orange.com>
> > To: "kea-users" <kea-users at lists.isc.org>
> > Sent: Wednesday, January 26, 2022 4:40:26 AM
> > Subject: [Kea-users] Globally cut circuit id option

> > Hello.

> > We faced a problem with some old equipment.

> > We use host database for host reservation

> > We make reservation via API.

> > In table “host” we use dhcp_identifier_type =2 to match circuit id.

> > It works but we have some old equipment that adds some kind of prefix to circuit
> > id option.

> > For example, on switch circuit id was configured to “CHN540579” but on packet
> > capture we see that switch adds some “prefix”

> > Part from capture:

> > Agent-Information Option 82, length 23:

> > Circuit-ID SubOption 1, length 11: ^A^ICHN540579

> > Question: is it possible to globally cut circuit id optin from end to 9
> > characters?
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