[Bug 2000325] Re: ipv6 duplicate address prevents interface configuration

[Ryan Harper]

To reproduce what happens on physical systems I create two VMs with nics
in the same bridge on the host.  Booting the first VM up and allowing
the network config to apply, and then when booting the second VM up
layer, as it applies the IPv6 address to the interface in the bridge,
the kernel detects a duplicate IPv6 address and networkd fails to
configure the interface.

This happens on Focal systemd-networkd, but works fine on Jammy; that is
the network configuration is applied (including the duplicate V6) but
critically the v4 address and routes are as well.

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https://bugs.launchpad.net/bugs/2000325

Title:
  ipv6 duplicate address prevents interface configuration

Status in systemd package in Ubuntu:
  New

Bug description:
  1) # lsb_release -rd 
  Description:	Ubuntu 20.04.5 LTS
  Release:	20.04

  2) # apt-cache policy systemd 
  systemd:
    Installed: 245.4-4ubuntu3.19
    Candidate: 245.4-4ubuntu3.19
    Version table:
   *** 245.4-4ubuntu3.19 500
          500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       245.4-4ubuntu3.15 500
          500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
       245.4-4ubuntu3 500
          500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

  3) Interface should be configured with all addresses and routes
  4) Interface is missing ipv4 and ipv6 static addresses and associated routes

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: systemd 245.4-4ubuntu3.19
  ProcVersionSignature: Ubuntu 5.4.0-135.152-generic 5.4.212
  Uname: Linux 5.4.0-135-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.25
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Thu Dec 22 16:13:11 2022
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  Lsusb-t:
   
  Lsusb-v: Error: command ['lsusb', '-v'] failed with exit code 1:
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  ProcEnviron:
   TERM=vt220
   PATH=(custom, no user)
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-135-generic root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: 1.13.0-1ubuntu1.1
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: http://192.168.14.1:4444/register.html
  dmi.modalias: dmi:bvnSeaBIOS:bvr1.13.0-1ubuntu1.1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-focal:cvnQEMU:ct1:cvrhttp//192.168.14.14444/register.html:
  dmi.product.family: cisco
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-focal
  dmi.sys.vendor: QEMU

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