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[Mathieu Trudel-Lapierre <mathieu.tl@xxxxxxxxx>]

Fixed in zesty:
https://launchpad.net/ubuntu/+source/isc-dhcp/4.3.3-5ubuntu17

** Changed in: isc-dhcp (Ubuntu Zesty)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1636530

Title:
  initramfs config script mixes IPv4 and IPv6 data in the
  net-$iface.conf file

Status in isc-dhcp package in Ubuntu:
  Fix Released
Status in isc-dhcp source package in Xenial:
  Triaged
Status in isc-dhcp source package in Yakkety:
  Triaged
Status in isc-dhcp source package in Zesty:
  Fix Released

Bug description:
  [Impact]
  To support the previous behavior with ipconfig, dhclient now ships a config script for the initramfs which is meant to write out /run/net-(interface name).conf, which may be read by later initramfs scripts to configure a remote rootfs or other networked features. Data for both IPv4 and IPv6 are written out to the same file, which can lead to confusion and incorrect behavior.

  [Test case]
  1) Boot a system with an iscsi rootfs on a network where no DHCP server answers.

  Current behavior:
  dhclient -6 results may be written out to the /run/net-$iface.conf file which would cause the boot process to continue, thinking it's done.

  Expected behavior:
  boot should only continue once a network is found (through DHCP, BOOTP, etc.).

  [Regression potential]
  This changes is not expected to cause any kind of regression. Use of isc-dhcp has been reverted in initramfs-tools, and as such the affected code paths would not be run.

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