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

[Dan Streetman]

> Reverting this upstream commit seems to fix the problem: 
> https://github.com/systemd/systemd/commit/0299deab53d2a087727a5d04c1500c322c48b63e

lxd and systemd have what I can only describe euphemistically as a
horrible relationship. Instead of carrying another patch on systemd to
get it working in lxd, could you try to work this out correctly, either
by convincing upstream systemd to change or convincing lxd to change?

Long term, it does Ubuntu no favors by hacking up systemd because lxd doesn't conform to the systemd container interface.
https://systemd.io/CONTAINER_INTERFACE/

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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:
  Fix Committed

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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