Hello,

Looking at the history for this case, the SRU got rejected by pitti
(Comment #29) because of a v-failed on the fix for LP: #1568485 which is
also included in this SRU.

Since then, LP: #1568485 has been verified and is now fix-released.
There is no longer any reason to hold on the trusty SRU for this bug.
The delta between this SRU and trusty-updates is now only the patch that
resolves this issue.

There should no longer be any roadblock for this SRU so I am re-
uploading the 12.6 package. I am also unsubscribing ubuntu-sponsors

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https://bugs.launchpad.net/bugs/1529815

Title:
  InfiniBand DHCP flow with PRA and DHCP relay not working

Status in isc-dhcp package in Ubuntu:
  Fix Released
Status in isc-dhcp source package in Trusty:
  In Progress
Status in isc-dhcp source package in Wily:
  Fix Committed
Status in isc-dhcp source package in Xenial:
  Fix Released

Bug description:
  [Impact]

   * Infiniband users relying on DHCP can't use DHCP relay.

  [Test Case]

   * Comment #13
   * Mellanox has tested themselves.
   * Clear way of knowing if fix worked (tcpdump).

  [Regression Potential]

   * Only related to Infiniband.
   * Infiniband support could stop working (unlikely, already tested).

  [Other Info]

  DHCP client is sending discover with Unicast type request for the
  offer, in this configuration of IB to ETH through a relay we need the
  type to be broadcast.

  The issue is that when using dhclient from the client on Ubuntu (and only on 
Ubuntu) with MOFED or inbox driver, we see that that DHCP server offers in 
unicast instead of broadcast. It seems there is no way to correct this from the 
client side using dhclient configuration file.
  this issue exist even when we use always-broadcast statement in configuration 
file.

  in other vendors we see that discover request type is broadcast.
  attached pcap files from working (other vendor) and not working (Ubuntu) 
clients.

  DHCP CLIENT (IPoIB)
  Ubuntu 14.04  kernel 3.13.0-74
  Mellanox OFED 3.1-1.0.3 or inbox driver
  isc-dhcp-client                  4.2.4-7ubuntu12.3

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