We solved this problem thanks to Casten Strotmann.
Thie Post is for everyone facing the same problem.
Last week, I migrated the network where our notebooks are provisioned. These
devices boot via PXE and then receive data from SCCM through a ProxyDHCP.
Previously, we also provided server and data files, but since the colleagues
from the Windows team like to modify those files for testing purposes, it was
easier to just rely on the Proxy.
With ISC, this setup works fine, but with KEA it does not. In ISC, the old boot
files were still present, but I excluded them during my initial tests.
## Solution:
For the PXE client to recognize an "enhanced" PXE-DHCP server, the DHCP server
must return DHCP Option 60 (vendor class identifier) with the value "PXEClient".
The ISC DHCP server does this – the configuration line is:
option PXEClient "PXEClient";
Kea DHCP, however, provides Option 60 with the value "505845436C69656E74". The
configuration for this is in ...
{
"always-send": false,
"code": 60,
"csv-format": false,
"data": "505845436C69656E74",
"name": "vendor-class-identifier",
"space": "dhcp4"
},
If a DHCPOFFER is received without an Option #60 tag "PXEClient", DHCP Discover
will be retried on the 4- and 8-second timeouts in an attempt to receive a PXE
response “”
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