[Bug 1689854] Re: Multiple DHCPv6 client interfaces fail to receive some server responses

[Dan Streetman]

** Patch added: "lp1689854-trusty.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1689854/+attachment/4874777/+files/lp1689854-trusty.debdiff

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https://bugs.launchpad.net/bugs/1689854

Title:
  Multiple DHCPv6 client interfaces fail to receive some server
  responses

Status in isc-dhcp package in Ubuntu:
  In Progress

Bug description:
  [Impact]

  When using isc-dhcp-client on a Trusty system, with multiple
  interfaces configured to use DHCPv6, not all the DHCPv6 clients will
  receive the server responses on some of the interfaces.  This results
  in not all DHCPv6 interfaces being configured.

  [Test Case]

  Set up a DHCPv6 server with multiple interfaces (3-4 is enough) and
  configure it to serve DHCPv6 on all the interfaces (as separate
  subnets).  The server release does not matter.  Set up a client system
  with the same number of interfaces, connected/bridged to the server
  interfaces.  The client must be a Trusty system.  Configure (with
  ifupdown via /etc/network/interfaces) all the interfaces to use
  DHCPv6, and reboot.  Keep rebooting until one or more of the DHCPv6
  interfaces fails to get an address; it should not take more than a few
  reboots.  After a failure, even manual ifdown/ifup on the failed
  interface will not get a DHCPv6 address.

  [Regression Potential]

  As this changes how the isc-dhcp-client binds to IPv6 sockets, this
  could cause problems when the client tries to bind, send, or receive,
  with this or other operations.

  [Other Info]

  This is fixed upstream already, and the patch is included in Xenial
  and later releases.  This patch is needed only in the Trusty release.

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