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[Launchpad Bug Tracker <1621507@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package initramfs-tools - 0.125ubuntu7

---------------
initramfs-tools (0.125ubuntu7) zesty; urgency=medium

  * scripts/functions: for configure_networking:
    - split out IPv6 options in its own cmdline parameter: ip6= ; always use
      dhclient in this case if the value set is anything other than 'off' or
      'none'. Furthermore, parse anything other than 'on', 'dhcp' or 'any' as
      the name of an interface. (LP: #1621507)
    - rework the stop conditions so that we properly handle the ROUNDTTT loop,
      timing out after a short period of time and trying again after a short
      sleep.
    - add a 'done' parameter for both ip= and ip6= so that we can properly
      exit the ROUNDTTT loop once we know that either there is no work to do,
      or that we've achieved what we wanted (that is, to bring up IPv4, IPv6,
      or possibly both).
    - return ip=dhcp to the ipconfig use case; if set, then ipconfig will be
      run using any interface available, or the BOOTIF if it was set.

 -- Mathieu Trudel-Lapierre <cyphermox@xxxxxxxxxx>  Mon, 17 Oct 2016
17:05:49 -0400

** Changed in: initramfs-tools (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1621507

Title:
  initramfs-tools configure_networking() fails to dhcp ipv6 addresses

Status in MAAS:
  In Progress
Status in initramfs-tools package in Ubuntu:
  Fix Released
Status in isc-dhcp package in Ubuntu:
  Fix Released
Status in klibc package in Ubuntu:
  Won't Fix
Status in open-iscsi package in Ubuntu:
  Fix Released
Status in initramfs-tools source package in Xenial:
  Triaged
Status in isc-dhcp source package in Xenial:
  Fix Released
Status in klibc source package in Xenial:
  Won't Fix
Status in open-iscsi source package in Xenial:
  Fix Released
Status in initramfs-tools source package in Yakkety:
  In Progress
Status in isc-dhcp source package in Yakkety:
  Fix Released
Status in klibc source package in Yakkety:
  Won't Fix
Status in open-iscsi source package in Yakkety:
  Fix Released
Status in klibc package in Debian:
  New

Bug description:
  initramfs' configure_networking function uses ipconfig to configure the network.
  ipconfig does not support dhcpv6.  See: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=627164

  Related bugs:
    * bug 1229458: grub2 needed changes
    * bug 1621615: network not configured when ipv6 netbooted into cloud-init
    * bug 1635716: Can't bring up a machine on a dual network (ipv4 and ipv6) 

  
  [Impact]

  It is not possible to netboot Ubuntu with a network-based root
  filesystem in an ipv6-only environment.  Anyone wanting to netboot in
  an ipv6-only environment is affected.

  These uploads address this by replacing the one-off klibc dhcp client
  (IPv4-only) with the defacto standard isc-dhcp-client, and thereby
  provide both ipv6 and ipv4 DHCP configuration.

  [Test Case]

  See Bug 1229458.  Configure radvd, dhcpd, and tftpd for your ipv6-only
  netbooting world.  Pass the boot process an ipv6 address to talk to,
  and see it fail to configure the network.

  [Regression Potential]

  1) This increases the uncompressed initramfs size by approximately 500KB, since isc-dhcp-client is added, but klibc is still needed for some other things, and is therefore present.  On systems with a very small /boot partition, this could result in failure to upgrade the initramfs.
  2) In at least some cases, DHCP network configuration shifts from klibc's ipconfig to isc-dhcp-client's dhclient.  This should be of minimal risk, as isc-dhcp-client is in very very widespread use.  In the event of a regression, network boot would fail, but the prior kernel should still be bootable.

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