This bug was fixed in the package klibc - 2.0.4-8ubuntu3

---------------
klibc (2.0.4-8ubuntu3) yakkety; urgency=medium

  * debian/patches/broadcast_dhcp_send.patch: the patch sets the wrong bit in
    the bootp flags field, instead of 0x800 it must be 0x8000. (LP: #1624014)

 -- Dan Streetman <dan.street...@canonical.com>  Fri, 16 Sep 2016
20:20:58 -0400

** Changed in: klibc (Ubuntu Yakkety)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1624014

Title:
  Wrong bit set in klibc PXE dhcp/bootp flags

Status in klibc package in Ubuntu:
  Fix Released
Status in klibc source package in Trusty:
  In Progress
Status in klibc source package in Xenial:
  In Progress
Status in klibc source package in Yakkety:
  Fix Released

Bug description:
  [Description]

  The patch for bug 1327412 set the wrong bit in the bootp flags field.
  It set flags to 0x800, but the correct value is 0x8000.  That sets the
  "broadcast" bit, and the spec requires all other bits to be 0.

  Setting one of the "must be zero" bits in the flags field causes some
  DHCP relay agents to drop the packets, causing PXE to fail.

  [Test Case]

  Get a DHCP relay agent that drops PXE packets with an invalid
  bootp.flags bit set, and try to PXE boot; it fails.

  [Regression]

  None, the previous patch introduced this regression.

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