Public bug reported:
Version:
--------
Ubuntu 26.04 Server using netplan and systemd v259'
Summary:
--------
'dhcp-identifier: mac' is stored in the netplan YAML and shows up in netplan
get, but it does not change the live DHCPv4 client ID on Ubuntu 26.04
Root Cause:
-----------
Netplan 1.2 writes 'ClientIdentifier=mac' under the old [DHCP] section
systemd 259 only reads that setting from [DHCPv4], so it keeps the default (use
DUID)
networkctl cat @IFACE shows an empty [DHCPv4] section and MAC-based DHCP
reservations fail after reboot
Local Workaround:
-----------------
I put 'ClientIdentifier=mac' in /etc/systemd/networkd.conf.d/ under [DHCPv4]
and everything worked again
** Affects: netplan.io (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2167907
Title:
'dhcp-identifier: mac' in netplan .yml config is ignored by systemd
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