[Bug 2107040] Re: networkd can't bridge a wlan access point

Fri Apr 18 19:35:12 UTC 2025

I saw your thread on systemd-devel, and I think that's the more
appropriate place for a question like this. I think this falls a bit
outside the scope of a bug report for Ubuntu's sake.

If you find that in fact something needs backporting to support your use
case, please let us know. But as far as "figuring out how to do this", I
think support forums/mailing lists are more appropriate.

** Changed in: systemd (Ubuntu)
       Status: New => Invalid

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Title:
  networkd can't bridge a wlan access point

Status in systemd package in Ubuntu:
  Invalid

Bug description:
  I'm trying to build a router with ubuntu server 24.04, using a device
  with some ethernets and a wifi, putting some ethernets and the wifi
  into one bridge.

  But I currently don't see how to make networkd do this.

  Example config (that doesn't work):

  /etc/netplan/60-bridge-lan.yaml

  network:
    version: 2
    renderer: networkd

    ethernets:
      enp4s0:
        dhcp4: no
      enp5s0:
        dhcp4: no

    wifis:      
      wlp1s0:
        dhcp4: no
        access-points:
          "hurra":
             mode:  ap
             password: something

    bridges:
      lan:
        dhcp4: no
        addresses:
          - "192.168.122.1/24"
          - "fdfc:1234:5678:1234::1/24"
        interfaces:
          - enp4s0
          - enp5s0
          - wlp1s0

  doesn't work:

  ERROR: wlp1s0: hurra: networkd does not support this wifi mode

  removing the wifis section, running the wifi with hostapd, and just list it as regular ethernet, as many howtos out there recommend, like

    ethernets:
      enp4s0:
        dhcp4: no
      enp5s0:
        dhcp4: no
      wlp1s0:
        dhcp4: no

  doesn't work either. Error message

  2025-04-11T14:11:29.023613+00:00 mini20 systemd-networkd[1281]:
  wlp1s0: Failed to set master interface: Device does not allow
  enslaving to a bridge. Operation not supported

  which is clearly wrong, since a manual

  brctl addif lan wlp1s0

  works properly

  and removing it from netplan, just listing it in the bridge member list results in 

  # networkctl 
  IDX LINK   TYPE     OPERATIONAL SETUP     
    1 lo     loopback carrier     unmanaged
    2 enp3s0 ether    routable    configured
    3 enp4s0 ether    enslaved    configured
    4 enp5s0 ether    no-carrier  configured
    5 enp6s0 ether    off         unmanaged
    6 wlp1s0 wlan     degraded    unmanaged
    7 lan    bridge   routable    configured

  man pages  systemd.netdev and systemd.network don't help either. 

  So how is this supposed to work? Just errecting a wifi access point and attaching it to a bridge with systemd tools/ubuntu server?

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: systemd 255.4-1ubuntu8.6
  ProcVersionSignature: Ubuntu 6.8.0-57.59-generic 6.8.12
  Uname: Linux 6.8.0-57-generic x86_64
  NonfreeKernelModules: zfs
  ApportVersion: 2.28.1-0ubuntu3.5
  Architecture: amd64
  CasperMD5CheckResult: pass
  Date: Fri Apr 11 13:33:18 2025
  InstallationDate: Installed on 2025-04-08 (3 days ago)
  InstallationMedia: Ubuntu-Server 24.04.2 LTS "Noble Numbat" - Release amd64 (20250216.2)
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 002: ID 05e3:0751 Genesys Logic, Inc. microSD Card Reader
   Bus 001 Device 003: ID 0bda:b85b Realtek Semiconductor Corp. Bluetooth Radio
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Lsusb-t:
   /:  Bus 001.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/8p, 480M
       |__ Port 006: Dev 002, If 0, Class=Mass Storage, Driver=usb-storage, 480M
       |__ Port 008: Dev 003, If 0, Class=Wireless, Driver=btusb, 12M
       |__ Port 008: Dev 003, If 1, Class=Wireless, Driver=btusb, 12M
   /:  Bus 002.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/6p, 10000M
  MachineType: Default string Default string
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.8.0-57-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro
  SourcePackage: systemd
  SystemdFailedUnits:
   Error: command ['systemctl', 'status', '--full', '●'] failed with exit code 4: Invalid unit name "●" escaped as "\xe2\x97\x8f" (maybe you should use systemd-escape?).
   Unit \xe2\x97\x8f.service could not be found.
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/17/2023
  dmi.bios.release: 5.19
  dmi.bios.vendor: American Megatrends International, LLC.
  dmi.bios.version: JK4LV107
  dmi.board.asset.tag: Default string
  dmi.board.name: Default string
  dmi.board.vendor: Default string
  dmi.board.version: Default string
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvrJK4LV107:bd04/17/2023:br5.19:svnDefaultstring:pnDefaultstring:pvrDefaultstring:rvnDefaultstring:rnDefaultstring:rvrDefaultstring:cvnDefaultstring:ct3:cvrDefaultstring:skuDefaultstring:
  dmi.product.family: Default string
  dmi.product.name: Default string
  dmi.product.sku: Default string
  dmi.product.version: Default string
  dmi.sys.vendor: Default string

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