ACD detected an ip conflict, but did not send a dhcp decline message.
Author: zyzferrariCreated Oct 27, 2025Updated Sep 15, 2026
Labelsbug 🐛networkdhcp
systemd version the issue has been seen with
255.x
Used distribution
No response
Linux kernel version used
6.6.35-yocto-standard
CPU architectures issue was seen on
None
Component
No response
Expected behaviour you didn't see
No response
Unexpected behaviour you saw
No response
Steps to reproduce the problem
No response
Additional program output to the terminal or log subsystem illustrating the issue
config file:
[Match]
Name=enu1u3
[Link]
MACAddress=E0:CA:3C:D2:3E:82
[Network]
DHCP=ipv4
[DHCPv4]
UseMTU=yes
RouteMetric=10
ClientIdentifier=mac
SendRelease=yes
SendDecline=yes
+++++++++++++++++++++++++++++++++++++++++++++++++++++
10月 27 18:44:51 minasd23e82 systemd-networkd[6315]: enu1u3: DHCPv4 address 192.168.31.21/24, gateway 192.168.31.1 acquired from 192.168.31.1
10月 27 18:44:51 minasd23e82 systemd-networkd[6315]: enu1u3: Configuring IPv4ACD for address 192.168.31.21.
10月 27 18:44:51 minasd23e82 systemd-networkd[6315]: enu1u3: IPv4ACD: init -> started
10月 27 18:44:51 minasd23e82 systemd-networkd[6315]: enu1u3: Requesting DHCPv4 address (n/a): 192.168.31.21/24 broadcast 192.168.31.255 (valid for 11h 59min 59s, preferred for 11h 59min 59s), flags: tentative, scope: global, label: n/a
10月 27 18:44:51 minasd23e82 systemd-networkd[6315]: enu1u3: Requesting DHCPv4 route (n/a): dst: 192.168.31.1/32, src: n/a, gw: n/a, prefsrc: 192.168.31.21, scope: link, table: main(254), proto: dhcp, type: unicast, nexthop: 0, priority: 10, flags: n/a
10月 27 18:44:51 minasd23e82 systemd-networkd[6315]: enu1u3: Requesting DHCPv4 route (n/a): dst: n/a, src: n/a, gw: 192.168.31.1, prefsrc: 192.168.31.21, scope: global, table: main(254), proto: dhcp, type: unicast, nexthop: 0, priority: 10, flags: n/a
10月 27 18:44:51 minasd23e82 systemd-networkd[6315]: enu1u3: Requesting DHCPv4 route (requesting): dst: 192.168.31.1/32, src: n/a, gw: n/a, prefsrc: 192.168.31.21, scope: link, table: main(254), proto: dhcp, type: unicast, nexthop: 0, priority: 10, flags: n/a
10��� 27 18:44:51 minasd23e82 systemd-networkd[6315]: enu1u3: link_check_ready(): dynamic addressing protocols are enabled but none of them finished yet.
10月 27 18:44:51 minasd23e82 systemd-networkd[6315]: enu1u3: IPv4ACD: started -> waiting-probe
10月 27 18:44:51 minasd23e82 systemd-networkd[6315]: Got message type=error sender=:1.54 destination=:1.53 path=n/a interface=n/a member=n/a cookie=4 reply_cookie=20 signature=s error-name=org.freedesktop.DBus.Error.AccessDenied error-message=Permission denied
10月 27 18:44:51 minasd23e82 systemd-networkd[6315]: Could not set hostname: Access denied
10�5�� 27 18:44:52 minasd23e82 systemd-networkd[6315]: enu1u3: NDISC: Sent Router Solicitation, next solicitation in 3s
10��� 27 18:44:52 minasd23e82 systemd-networkd[6315]: enu1u3: IPv4ACD: Probing 192.168.31.21
10月 27 18:44:52 minasd23e82 systemd-networkd[6315]: enu1u3: IPv4ACD: waiting-probe -> probing
10月 27 18:44:52 minasd23e82 systemd-networkd[6315]: enu1u3: IPv4ACD: Conflict on 192.168.31.21 (1)
10月 27 18:44:52 minasd23e82 systemd-networkd[6315]: enu1u3: IPv4ACD: probing -> initSource: systemd/systemd