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

[Brian Murray]

Hello Talat, or anyone else affected,

Accepted isc-dhcp into xenial-proposed. The package will build now and
be available at https://launchpad.net/ubuntu/+source/isc-
dhcp/4.3.3-5ubuntu12.1 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

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

** Tags added: verification-needed

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

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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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