Ubuntu
systemd package

VLAN gets IP address assignment from parent device when using "match macaddress"

Bug #1988657 reported by Marvin Glenn
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
netplan
Confirmed
Undecided
Unassigned
netplan.io (Ubuntu)
Confirmed
Undecided
Unassigned
systemd (Ubuntu)
Confirmed
Low
Unassigned

Bug Description

System is Ubuntu 18.04 with Netplan 0.99-0ubuntu3~18.04.5(amd64)

When using the "match macaddress" mechanism to guarantee the assignment of the ethernet device name to a particular port, VLANs added to that device will not get the the IP addresses assigned to them but rather the IP address of the parent ethernet device.

In the example below from my system, the 'l2club' VLAN would get the 192.168.2.1 address, along with eno1 receiving it. The address 10.232.228.16 was not assigned to anything. With the "match macaddress" section was removed, both interfaces would then get the IP addresses that were expected.

network:
  version: 2
  renderer: networkd
  ethernets:
    eno1:
      match:
        macaddress: 00:24:e8:00:00:00
      addresses:
        - 192.168.2.1/24
  vlans:
    l2club:
      id: 10
      link: eno1
      addresses:
        - 10.232.228.16/8

Revision history for this message
Simon Chopin (schopin) wrote (last edit ):

I just tried it on all releases up to Kinetic, they're all affected. I suspect it's actually a bug in systemd-networkd, as the files generated in /run/systemd/networkd/ look sane enough:

root@firm-mayfly:~# cat /run/systemd/network/10-netplan-eno1.network
[Match]
MACAddress=00:16:3e:10:7a:c2
Type=!vlan bond bridge

[Network]
LinkLocalAddressing=ipv6
Address=192.168.2.1/24
VLAN=l2club

root@firm-mayfly:~# cat /run/systemd/network/10-netplan-l2club.netdev
[NetDev]
Name=l2club
Kind=vlan

[VLAN]
Id=10

root@firm-mayfly:~# cat /run/systemd/network/10-netplan-l2club.network
[Match]
Name=l2club

[Network]
LinkLocalAddressing=ipv6
Address=10.232.228.16/8
ConfigureWithoutCarrier=yes

There wasn't anything suspicious in the journald logs, either.

tags: added: rls-kk-incoming
Changed in netplan:
status: New → Confirmed
Changed in netplan.io (Ubuntu):
status: New → Confirmed
Changed in systemd (Ubuntu):
status: New → Confirmed
Brian Murray (brian-murray)
tags: added: rls-kk-notfixing
removed: rls-kk-incoming
Nick Rosbrook (enr0n)
Changed in systemd (Ubuntu):
importance: Undecided → Low
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