[Bug 1529815] Re: InfiniBand DHCP flow with PRA and DHCP relay not working

[Martin Pitt]

Note for the trusty update: This includes the SRU for bug 1568485 which
is v-failed, so the current package cannot be accepted. Either upload an
ubuntu12.6 without the changes from 12.5, or coordinate with the
uploader of the previous SRU to fix/update/merge the changes.

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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 Committed

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]

  None

  [ Original Description ]
   
   * Anything else you think is useful to include
   * Anticipate questions from users, SRU, +1 maintenance, security teams and the Technical Board
   * and address these questions in advance

  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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