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

[Talat Batheesh]

The DHCP Relay issue still has not been resolved.
The issue was DHCP Offer packets that being sent from the DHCP server are not reaching the client.

Setup:
DHCP Client: IB Side        Ubuntu OS with ConnectX3 FW ver 2.35.5000, Mellanox OFED 3.2-1.0.1            
DHCP Server: ETH Side   Win2012  R2 with ConnectX3 FW ver 2.35.5000, WinOF 5.10                                    
SX GW, MLNX_OS ver 3.4.3002                                                                                                         

Looking at the traffic capture I can see packets are coming from the Windows server towards the switch, but never leaving it.
Please refer to the following traffic capture files attached to the case:
Ibdump_dhcp – capture of ib0
Dhcp.pcap – port mirroring of the ETH port connected to the Windows
Dhcp_win2012 - wireshark capture of the windows dhcp server 

Setup details is mentioned &  marked above.


Setup:
IB Side:     DHCP Client  Ubunutu 14.04,   OFED 3.2-1.0.1.1,  CX3 2.35.5000 (10.7.55.193)
ETH Side: DHCP Server Win2012 R2,         WinOF 5.10,            CX3 2.35.5000 (10.7.55.190)
SX1036  GW:   MLNX_OS ver 3.4.3002

Before installing the PPA
DHCP client sends discover, DHCP server send offer, however the packet never reach the client, bootp flag is Unicast


** Attachment added: "dhcpcase files"
   https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1529815/+attachment/4597819/+files/dhcpcase.rar

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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:
  In Progress
Status in isc-dhcp source package in Trusty:
  In Progress
Status in isc-dhcp source package in Wily:
  In Progress
Status in isc-dhcp source package in Xenial:
  In Progress

Bug description:
  
  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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