Send dhcp-users mailing list submissions to
dhcp-users@lists.isc.org
To subscribe or unsubscribe via the World Wide Web, visit
https://lists.isc.org/mailman/listinfo/dhcp-users
or, via email, send a message with subject or body 'help' to
dhcp-users-requ...@lists.isc.org
You can reach the person managing the list at
dhcp-users-ow...@lists.isc.org
When replying, please edit your Subject line so it is more specific
than "Re: Contents of dhcp-users digest..."
Today's Topics:
1. Correct use of DHCP option 97 (Arzhel Younsi)
----------------------------------------------------------------------
Message: 1
Date: Thu, 16 Nov 2023 12:30:54 +0100
From: Arzhel Younsi <ayou...@wikimedia.org>
To: dhcp-users@lists.isc.org
Subject: Correct use of DHCP option 97
Message-ID:
<CAD236MiznFSmkBPcoj-FC=xt-ymnch7q2mcw5dfcsxmcrjk...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi,
We're currently using DHCP option 82 (circuit id) to identify servers
during their initial bootstrapping with the following ISC-DHCP 4.4.1
configuration:
host sretest1004 {
host-identifier option agent.circuit-id
"lsw1-e8-eqiad:Ethernet0.0:private1-e8-eqiad";
fixed-address 10.64.158.2;
option pxelinux.pathprefix "
http://apt.wikimedia.org/tftpboot/bullseye-installer/";;
}
This is working fine but option 82 has been more and more problematic to
use, so I've been looking at using option 97 instead as the server's serial
# is embedded in the UUID/GUID sent by PXE.
You can see below the output of dhcpdump. Note that the server's PXE
doesn't send option 61 (client-identifier).
log(binary-to-ascii(16, 8, ":", option pxe-client-id)); does return
0:44:45:4c:4c:5a:0:10:59:80:5a:c4:c0:4f:51:50:32
Which fits what's in Wireshark: https://phabricator.wikimedia.org/F41504283
But I tried all the combinations I could think of to match on it, with
no success.
For example:
host-identifier option pxe-client-id 0
00:44:45:4c:4c:5a:00:10:59:80:5a:c4:c0:4f:51:50:32;
host-identifier option pxe-client-id 0
44:45:4c:4c:5a:00:10:59:80:5a:c4:c0:4f:51:50:32; (in case the initial 00:
was the type).
With quotes, with an additional 01: or ff: prefix, without the
"host-identifier" statement. With "dhcp-client-identifier" instead, just in
case.
Similarly with the GUID:
host-identifier option pxe-client-id 0
"4c4c4544-005a-5910-805a-c4c04f515032";
host-identifier option pxe-client-id 0
4c:4c:45:44:00:5a:59:10:80:5a:c4:c0:4f:51:50:32;
etc, still no success.
Does anyone have any pointers on how to get it to match on the option 97
value ?
Thanks
TIME: 2023-11-14 13:50:44.837
IP: 10.64.146.14 (5c:5e:ab:3d:87:c3) > 208.80.154.74 (aa:0:0:22:9f:cc)
OP: 1 (BOOTPREQUEST)
HTYPE: 1 (Ethernet)
HLEN: 6
HOPS: 1
XID: 2d295df0
SECS: 64
FLAGS: 7f80
CIADDR: 0.0.0.0
YIADDR: 0.0.0.0
SIADDR: 0.0.0.0
GIADDR: 10.64.158.1
CHADDR: b0:26:28:29:5d:f0:00:00:00:00:00:00:00:00:00:00
SNAME: .
FNAME: .
OPTION: 53 ( 1) DHCP message type 1 (DHCPDISCOVER)
OPTION: 55 ( 24) Parameter Request List 1 (Subnet mask)
2 (Time offset)
3 (Routers)
5 (Name server)
6 (DNS server)
11 (Resource location server)
12 (Host name)
13 (Boot file size)
15 (Domainname)
16 (Swap server)
17 (Root path)
18 (Extensions path)
43 (Vendor specific info)
54 (Server identifier)
60 (Vendor class identifier)
67 (Bootfile name)
128 (???)
129 (???)
130 (???)
131 (???)
132 (???)
133 (???)
134 (???)
135 (???)
OPTION: 57 ( 2) Maximum DHCP message size 1260
OPTION: 97 ( 17) UUID/GUID 0044454c4c5a0010 .DELLZ..
59805ac4c04f5150 Y.Z..OQP
32 2
OPTION: 93 ( 2) Client System 0000 ..
OPTION: 94 ( 3) Client NDI 010201 ...
OPTION: 60 ( 32) Vendor class identifier PXEClient:Arch:00000:UNDI:002001
OPTION: 82 ( 30) Relay Agent Information
Circuit-ID 45:74:68:65:72:6e:65:74:30
Remote-ID
63:34:3a:35:61:3a:62:31:3a:31:61:3a:36:33:3a:30:37
--
Arzhel
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<https://lists.isc.org/pipermail/dhcp-users/attachments/20231116/dd31e1b3/attachment-0001.htm>
------------------------------
Subject: Digest Footer
_______________________________________________
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
------------------------------
End of dhcp-users Digest, Vol 180, Issue 5
******************************************
