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

Wed Feb 10 04:42:56 UTC 2016

Talat,

I was able to set the Broadcast flag in a DHCP negotiation when using IB
interface.

Trusty patch is possibly ready.

TCPDUMP from the OFFER and ACK:

$ sudo tcpdump -i ib0 -nn -vvv -S
tcpdump: listening on ib0, link-type LINUX_SLL (Linux cooked), capture size 65535 bytes

04:38:01.051682 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request, length 300, htype 32, hlen 0, xid 0xb48b8735, Flags [Broadcast] (0x8000)
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Discover
	    Hostname Option 12, length 5: "dixie"
	    Parameter-Request Option 55, length 13:
	      Subnet-Mask, BR, Time-Zone, Default-Gateway
	      Domain-Name, Domain-Name-Server, Option 119, Hostname
	      Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
	      NTP
	    Client-ID Option 61, length 17: hardware-type 56, 30:3a:30:30:3a:30:30:3a:34:38:3a:46:45:3a:38:30
	    END Option 255, length 0
	    PAD Option 0, length 0, occurs 15

04:38:01.051936 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    172.16.0.1.67 > 255.255.255.255.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, htype 32, hlen 0, xid 0xb48b8735, Flags [Broadcast] (0x8000)
	  Your-IP 172.16.0.19
	  Server-IP 172.16.0.1
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Offer
	    Server-ID Option 54, length 4: 172.16.0.1
	    Lease-Time Option 51, length 4: 600
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    BR Option 28, length 4: 172.16.0.255
	    Domain-Name Option 15, length 7: "myib.cu"
	    END Option 255, length 0
	    PAD Option 0, length 0, occurs 23

04:38:01.052215 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request, length 300, htype 32, hlen 0, xid 0xb48b8735, Flags [Broadcast] (0x8000)
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Request
	    Server-ID Option 54, length 4: 172.16.0.1
	    Requested-IP Option 50, length 4: 172.16.0.19
	    Hostname Option 12, length 5: "dixie"
	    Parameter-Request Option 55, length 13:
	      Subnet-Mask, BR, Time-Zone, Default-Gateway
	      Domain-Name, Domain-Name-Server, Option 119, Hostname
	      Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
	      NTP
	    Client-ID Option 61, length 17: hardware-type 56, 30:3a:30:30:3a:30:30:3a:34:38:3a:46:45:3a:38:30
	    END Option 255, length 0
	    PAD Option 0, length 0, occurs 3

04:38:01.052342 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    172.16.0.1.67 > 255.255.255.255.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, htype 32, hlen 0, xid 0xb48b8735, Flags [Broadcast] (0x8000)
	  Your-IP 172.16.0.19
	  Server-IP 172.16.0.1
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: ACK
	    Server-ID Option 54, length 4: 172.16.0.1
	    Lease-Time Option 51, length 4: 600
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    BR Option 28, length 4: 172.16.0.255
	    Domain-Name Option 15, length 7: "myib.cu"
	    END Option 255, length 0
	    PAD Option 0, length 0, occurs 23

I'll review this tomorrow and release the PPA for you to test.

I have also to review isc-dhcp IB support for Vivid/Wily/Xenial.

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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

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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