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

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Launchpad Bug Tracker <1529815@xxxxxxxxxxxxxxxxxx>
Date: Thu, 08 Sep 2016 15:49:26 -0000
Reply-to: Bug 1529815 <1529815@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

This bug was fixed in the package isc-dhcp - 4.2.4-7ubuntu12.6

---------------
isc-dhcp (4.2.4-7ubuntu12.6) trusty; urgency=medium

  * Fixed missing broadcast flag for Infiniband interfaces (LP: #1529815)
    - added:
      + d/p/dhcp-4.2.4-dhclient-options-changed.patch

 -- Rafael David Tinoco <rafael.tinoco@xxxxxxxxxxxxx>  Tue, 07 Jun 2016
15:29:50 +0200

** Changed in: isc-dhcp (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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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:
  Fix Released
Status in isc-dhcp source package in Wily:
  Won't Fix
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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