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Today's Topics:
1. Re: option 67 boot-file-name FF00 at the end of the data
string (Darren Ankney)
2. Re: kea-dhcp4 behaviour question client-class vs reservations
(Darren Ankney)
----------------------------------------------------------------------
Message: 1
Date: Sat, 27 Apr 2024 11:29:06 -0400
From: Darren Ankney <darren.ank...@gmail.com>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: option 67 boot-file-name FF00 at the end of the data
string
Message-ID:
<CAKabWHiqoNU=GqaxitHvWS4v9==e8e0yhp6p+d_vnnj7hd3...@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Hi Philipp,
You would need to specify the entire string in hex instead as noted in
the ARM:
https://kea.readthedocs.io/en/kea-2.4.1/arm/dhcp4-srv.html#standard-dhcpv4-options
---
Kea supports the following formats when specifying hexadecimal data:
Delimited octets - one or more octets separated by either colons or
spaces (":" or " "). While each octet may contain one or two digits,
we strongly recommend always using two digits. Valid examples are
"ab:cd:ef" and "ab cd ef".
String of digits - a continuous string of hexadecimal digits with or
without a "0x" prefix. Valid examples are "0xabcdef" and "abcdef".
---
There is also an example of doing this there:
---
"Dhcp4": {
"option-data": [
{
"name": "domain-name-servers",
"code": 6,
"space": "dhcp4",
"csv-format": false,
"data": "C0 00 03 01 C0 00 03 02"
},
...
],
...
}
---
Thank you,
Darren Ankney
On Fri, Apr 26, 2024 at 4:52?AM Jan-Philipp Snizek
<jan-philipp.sni...@business.uzh.ch> wrote:
>
> Hi
>
> In isc-dhcpd I use as option 67 option bootfile-name
> "SMSBoot\\x64\\wdsmgfw.efi\000";
> This works with any uefi bios, older or new.
>
> How do I do the end of string sequence \000 in kea-dhcp4?
>
> There seem to be older uefi BIOSes that upon receiving the option 67 string,
> they attach FF00 at the end of the string and then try to load the efi file.
> This ends with the ftfp server returning 'file not found'.
> How do I have to do this end-of-file sequence in Kea-dhcp4? Is that even the
> correct name for this? I'm not sure, I usually don't play with these lower
> level things.
>
> For reference, here's the relevant part of the kea-dhcp4 config file that
> works with recent uefi bioses:
>
> "client-classes": [
> {
> "name": "pxeclientx64",
> "test": "option[60].text == 'PXEClient:Arch:00007:UNDI:003016'",
> "option-data": [
> { "name": "boot-file-name", "data":
> "SMSBoot\\x64\\wdsmgfw.efi" },
> { "name": "tftp-server-name", "code": 66, "data":
> "tftp-server.mydomain.local" }
> ]
> }
> ],
>
> Thanks,
>
> --
>
> Philipp
> --
> ISC funds the development of this software with paid support subscriptions.
> Contact us at https://www.isc.org/contact/ for more information.
>
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
------------------------------
Message: 2
Date: Sat, 27 Apr 2024 11:35:10 -0400
From: Darren Ankney <darren.ank...@gmail.com>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: kea-dhcp4 behaviour question client-class vs reservations
Message-ID:
<CAKabWHhxz1zrByopsKs6_a-LJS-3fzfgcwW8XWGzF=vej_1...@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Hi Philipp,
The keyword "client-class" restricts access to the pool to members of
the class. It does not assign members of a class to a pool. See
here:
https://kea.readthedocs.io/en/kea-2.4.1/arm/classify.html#configuring-pools-with-class-information
where it says "Similar to subnets, in certain cases access to certain
address or prefix pools must be restricted to only clients that belong
to a given class, using the client-class when defining the pool.".
Thank you,
Darren Ankney
On Fri, Apr 26, 2024 at 5:05?AM Jan-Philipp Snizek
<jan-philipp.sni...@business.uzh.ch> wrote:
>
> Hi
>
> I would like to ask a question regarding precedence behavior of kea-dhcp4.
>
> Let's take this working config:
>
> "client-classes": [
> {
> "name": "pxeclientx64",
> "test": "option[60].text == 'PXEClient:Arch:00007:UNDI:003016'",
> "option-data": [
> { "name": "vendor-encapsulated-options", "always-send": false
> },
> { "name": "boot-file-name", "data":
> "SMSBoot\\x64\\wdsmgfw.efi" },
> { "name": "tftp-server-name", "code": 66, "data":
> "my-tftp-server.domain.local" }
> ]
> }
> ],
> "subnet4": [
> {
> "id": 1,
> "subnet": "172.20.19.0/24",
> "next-server": "172.20.19.1",
> "pools": [
> { "pool": "172.20.19.120 - 172.20.19.129" },
> { "pool": "172.20.19.130 - 172.20.19.139",
> "client-class": "pxeclientx64" }
> ],
> "reservation-mode": "out-of-pool",
> "reservations": [
> { "hostname": "pxeboot1", "hw-address": "00:e0:4c:68:0a:f1",
> "ip-address": "172.20.19.150" }
> ],
> "option-data": [
> { "name": "routers", "data": "172.20.19.1" }
> ]
> }
> ],
>
> If the client with the reservation executes a PXE boot it gets the reserved
> IP .19.150 and successfully boots PXE.
> The kea-dhcp4 log looks like this:
> Apr 25 13:53:17 hellbox kea-dhcp4[16858]: INFO EVAL_RESULT Expression
> pxeclientx64 evaluated to 1
> Apr 25 13:53:17 hellbox kea-dhcp4[16858]: INFO DHCP4_LEASE_ADVERT [hwtype=1
> 00:e0:4c:68:0a:c1], cid=[no info], tid=0x2223e0e3: lease 172.20.19.150 will
> be advertised
> Apr 25 13:53:20 hellbox kea-dhcp4[16858]: INFO EVAL_RESULT Expression
> pxeclientx64 evaluated to 1
> Apr 25 13:53:20 hellbox kea-dhcp4[16858]: INFO DHCP4_LEASE_ALLOC [hwtype=1
> 00:e0:4c:68:0a:c1], cid=[no info], tid=0x2223e0e3: lease 172.20.19.150 has
> been allocated for 3600 seconds
> As we can see both matches: pxeclientx64 and the reservation. The client
> successfully boots pxe.
> I don't understand why the client successfully pxe boots. The client-class
> "pxeclientx64" is assigned to a pool. It is neither assigned to the subnet4 {
> id: 1 } subnet declaration nor to the reservation.
> What has precedence over what? How does inheritance work in kea?
>
> Thanks,
>
> --
>
> Philipp
>
> --
> ISC funds the development of this software with paid support subscriptions.
> Contact us at https://www.isc.org/contact/ for more information.
>
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
------------------------------
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