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[Launchpad Bug Tracker <1621507@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package isc-dhcp - 4.3.3-5ubuntu14

---------------
isc-dhcp (4.3.3-5ubuntu14) yakkety; urgency=medium

  * Add an initramfs-tools hook and ship everything we need to run dhclient in
    the initramfs. This is necessary for proper IPv6 netboot support.
    (LP: #1621507)

 -- Mathieu Trudel-Lapierre <cyphermox@xxxxxxxxxx>  Wed, 21 Sep 2016
09:57:48 -0400

** Changed in: isc-dhcp (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:
  Triaged
Status in initramfs-tools package in Ubuntu:
  In Progress
Status in isc-dhcp package in Ubuntu:
  Fix Released
Status in klibc package in Ubuntu:
  Confirmed
Status in open-iscsi package in Ubuntu:
  Fix Committed
Status in initramfs-tools source package in Xenial:
  Fix Committed
Status in isc-dhcp source package in Xenial:
  Fix Released
Status in klibc source package in Xenial:
  Confirmed
Status in open-iscsi source package in Xenial:
  Fix Committed
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

  [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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