[Bug 1950794] [NEW] DHCPv4 (IAID+DUID) networking broken in LXC containers

[Lukas Märdian]

Public bug reported:

DHCPv4 networking does not work in the default IAID+DUID
(ClientIdentifier=duid) mode in LXC containers, using systemd-networkd
v249.5-2ubuntu1. Static configuration and DHCPv6 work without problem.

Reproducer:
$ lxc launch ubuntu-daily:jammy jj
$ lxc exec jj bash
# add-apt-repository ppa:ci-train-ppa-service/4704
# apt install systemd # install systemd 249.5-2ubuntu1
# cat /etc/systemd/network/00-test.network
[Match]
Name=eth0

[Network]
DHCP=ipv4
# systemctl restart systemd-networkd.service
# networkctl 
IDX LINK     TYPE     OPERATIONAL SETUP    
[...]
611 eth0     ether    carrier     failed  

A workaround is to avoid IAID+DUID mode via:
[DHCPv4]
#ClientIdentifier=mac
ClientIdentifier=duid-only

Interesting logs:
Nov 12 14:10:48 jj systemd-networkd[174]: eth0: Requested to activate link
Nov 12 14:10:48 jj systemd-networkd[174]: eth0: DHCPv4 client: Failed to set IAID: Device or resource busy
Nov 12 14:10:48 jj systemd-networkd[174]: eth0: DHCP4 CLIENT: Failed to set IAID+DUID: Device or resource busy
Nov 12 14:10:48 jj systemd-networkd[174]: Failed to check link is initialized: Device or resource busy
Nov 12 14:10:48 jj systemd-networkd[174]: eth0: Failed

** Affects: lxd (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "debug.log"
   https://bugs.launchpad.net/bugs/1950794/+attachment/5540425/+files/debug.log

** Summary changed:

- DHCPv4 networking broken in LXC containers (IAID+DUID / ClientIdentifier=duid)
+ DHCPv4 (IAID+DUID) networking broken in LXC containers

** Also affects: lxd (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1950794

Title:
  DHCPv4 (IAID+DUID) networking broken in LXC containers

Status in lxd package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  DHCPv4 networking does not work in the default IAID+DUID
  (ClientIdentifier=duid) mode in LXC containers, using systemd-networkd
  v249.5-2ubuntu1. Static configuration and DHCPv6 work without problem.

  Reproducer:
  $ lxc launch ubuntu-daily:jammy jj
  $ lxc exec jj bash
  # add-apt-repository ppa:ci-train-ppa-service/4704
  # apt install systemd # install systemd 249.5-2ubuntu1
  # cat /etc/systemd/network/00-test.network
  [Match]
  Name=eth0

  [Network]
  DHCP=ipv4
  # systemctl restart systemd-networkd.service
  # networkctl 
  IDX LINK     TYPE     OPERATIONAL SETUP    
  [...]
  611 eth0     ether    carrier     failed  

  A workaround is to avoid IAID+DUID mode via:
  [DHCPv4]
  #ClientIdentifier=mac
  ClientIdentifier=duid-only

  Interesting logs:
  Nov 12 14:10:48 jj systemd-networkd[174]: eth0: Requested to activate link
  Nov 12 14:10:48 jj systemd-networkd[174]: eth0: DHCPv4 client: Failed to set IAID: Device or resource busy
  Nov 12 14:10:48 jj systemd-networkd[174]: eth0: DHCP4 CLIENT: Failed to set IAID+DUID: Device or resource busy
  Nov 12 14:10:48 jj systemd-networkd[174]: Failed to check link is initialized: Device or resource busy
  Nov 12 14:10:48 jj systemd-networkd[174]: eth0: Failed

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