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

[Louis Bouchard]

** Tags removed: sts-sru

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Title:
  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Launchpad Bug Tracker]

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   Tue, 07 Jun 2016
15:29:50 +0200

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

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

Verification for Trusty:

## server

root@dixie:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:Ubuntu 14.04.5 LTS
Release:14.04
Codename:   trusty

root@dixie:~# dpkg -l | grep dhcp
ii  isc-dhcp-client 4.2.4-7ubuntu12.6amd64  
  ISC DHCP client
ii  isc-dhcp-common 4.2.4-7ubuntu12.6amd64  
  common files used by all the isc-dhcp* packages
ii  isc-dhcp-server 4.2.4-7ubuntu12.6amd64  
  ISC DHCP server for automatic IP address assignment

## client

root@hertz:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:Ubuntu 14.04.5 LTS
Release:14.04
Codename:   trusty

root@hertz:~# dpkg -l | grep dhcp
ii  isc-dhcp-client 4.2.4-7ubuntu12.6amd64  
  ISC DHCP client
ii  isc-dhcp-common 4.2.4-7ubuntu12.6amd64  
  common files used by all the isc-dhcp* packages

--

## tcpdump showing broadcast flag set (client was able to get IP)

root@dixie:~# tcpdump -i ib0 -nn -vvv -S
Sep  8 12:31:32 dixie kernel: [ 1763.559815] device ib0 entered promiscuous mode
tcpdump: listening on ib0, link-type LINUX_SLL (Linux cooked), capture size 
65535 bytes
Sep  8 12:31:36 dixie dhcpd: DHCPDISCOVER from  via ib0
Sep  8 12:31:36 dixie dhcpd: DHCPOFFER on 172.16.0.19 to  via ib0
Sep  8 12:31:36 dixie dhcpd: Dynamic and static leases present for 172.16.0.19.
Sep  8 12:31:36 dixie dhcpd: Remove host declaration dixie or remove 172.16.0.19
Sep  8 12:31:36 dixie dhcpd: from the dynamic address pool for 172.16.0.0/24
Sep  8 12:31:36 dixie dhcpd: DHCPREQUEST for 172.16.0.19 (172.16.0.1) from  via 
ib0
Sep  8 12:31:36 dixie dhcpd: DHCPACK on 172.16.0.19 to  via ib0
12:31:36.612464 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 0x6189781a, Flags [Broadcast] (0x8000)
  Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 5: "hertz"
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
12:31:36.612713 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 0x6189781a, 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
12:31:36.612957 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 0x6189781a, 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: "hertz"
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
12:31:36.613122 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 0x6189781a, 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: 

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

[Rafael David Tinoco]

Okay, bug:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1496942

Is avoiding me to verify this. 
The lab I was able to get was a ConnectX-4 HCA lab (I was planning to use 
SR-IOV). 
I'll check if I can have two ConnectX-3 servers to verify this.

Be back soon.

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

After long time I got the lab back so I'm verifying Trusty right now.

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Mathew Hodson]

** Changed in: isc-dhcp (Ubuntu Wily)
   Status: Fix Committed => Won't Fix

** Tags removed: verification-needed-wily

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Chris J Arges]

Hello Talat, or anyone else affected,

Accepted isc-dhcp into trusty-proposed. The package will build now and
be available at https://launchpad.net/ubuntu/+source/isc-
dhcp/4.2.4-7ubuntu12.6 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 Trusty)
   Status: In Progress => Fix Committed

** Tags added: verification-needed

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Louis Bouchard]

Hello,

Looking at the history for this case, the SRU got rejected by pitti
(Comment #29) because of a v-failed on the fix for LP: #1568485 which is
also included in this SRU.

Since then, LP: #1568485 has been verified and is now fix-released.
There is no longer any reason to hold on the trusty SRU for this bug.
The delta between this SRU and trusty-updates is now only the patch that
resolves this issue.

There should no longer be any roadblock for this SRU so I am re-
uploading the 12.6 package. I am also unsubscribing ubuntu-sponsors

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

Subscribing sponsors again so Trusty can be sponsored. Still waiting on
SRU for Trusty.

** Tags removed: verification-needed-trusty

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

I think I should skip Wily verification (EOL) and pursue Trusty verification.
It looks like Trusty fix wasn't committed. Could you commit Trusty so I can 
verify it ?

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Adam Conrad]

** Tags removed: verification-done
** Tags added: verification-done-xenial

** Tags added: verification-needed-trusty verification-needed-wily

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Launchpad Bug Tracker]

This bug was fixed in the package isc-dhcp - 4.3.3-5ubuntu12.1

---
isc-dhcp (4.3.3-5ubuntu12.1) xenial; 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 (Inaddy)   Wed, 08
Jun 2016 10:51:06 +0200

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

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

Verification for Xenial:

ubuntu@dixie:~$ uname -a
Linux dixie 4.4.0-31-generic #50-Ubuntu SMP Wed Jul 13 00:07:12 UTC 2016 x86_64 
x86_64 x86_64 GNU/Linux

ubuntu@dixie:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:Ubuntu 16.04.1 LTS
Release:16.04
Codename:   xenial

ubuntu@dixie:~$ dpkg -l | grep isc-dhcp
ii  isc-dhcp-client4.3.3-5ubuntu12.1   amd64
DHCP client for automatically obtaining an IP address
ii  isc-dhcp-common4.3.3-5ubuntu12.1   amd64
common files used by all of the isc-dhcp packages
ii  isc-dhcp-server4.3.3-5ubuntu12.1   amd64
ISC DHCP server for automatic IP address assignment

You can observe that DHCP works AND broadcast flag is set (by sniffing
dhcp server ib0 interface):

ubuntu@dixie:~$ sudo tcpdump -i ib0 -nn -vvv -S
tcpdump: listening on ib0, link-type LINUX_SLL (Linux cooked), capture size 
262144 bytes
16:21:22.603191 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 0x6775c96f, Flags [Broadcast] (0x8000)
  Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 5: "hertz"
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
16:21:22.603401 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 0x6775c96f, 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
16:21:22.603586 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 0x6775c96f, 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: "hertz"
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
16:21:22.603758 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 0x6775c96f, 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

Everything looks good!!


** Tags removed: verification-needed
** Tags added: verification-done

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Mathew Hodson]

** Description changed:

  [Impact]
  
-  * Infiniband users relying on DHCP can't use DHCP relay.
+  * 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).
+  * 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).
+  * 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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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Martin Pitt]

Unsubscribing ubuntu-sponsors.

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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[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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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Louis Bouchard]

** Tags removed: sts-sponsor

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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[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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Title:
  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Launchpad Bug Tracker]

This bug was fixed in the package isc-dhcp - 4.3.3-5ubuntu13

---
isc-dhcp (4.3.3-5ubuntu13) yakkety; 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 (Inaddy)   Tue, 07
Jun 2016 15:52:40 +0200

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

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Louis Bouchard]

** Tags added: sts-sru

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

** Tags added: sts sts-sponsor

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

** Description changed:

+ [Impact]
  
- 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.
+  * 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) 
+ 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

** Changed in: isc-dhcp (Ubuntu Wily)
 Assignee: (unassigned) => Rafael David Tinoco (inaddy)

** Changed in: isc-dhcp (Ubuntu Trusty)
 Assignee: (unassigned) => Rafael David Tinoco (inaddy)

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

** Patch added: "xenial_isc-dhcp_4.3.3-5ubuntu13.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1529815/+attachment/4656431/+files/xenial_isc-dhcp_4.3.3-5ubuntu13.debdiff

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

** Patch added: "wily_isc-dhcp_4.3.1-5ubuntu3.2.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1529815/+attachment/4656430/+files/wily_isc-dhcp_4.3.1-5ubuntu3.2.debdiff

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

** Patch removed: "trusty_isc-dhcp_4.2.4-7ubuntu12.5.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1529815/+attachment/4568523/+files/trusty_isc-dhcp_4.2.4-7ubuntu12.5.debdiff

** Patch added: "trusty_isc-dhcp_4.2.4-7ubuntu12.6.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1529815/+attachment/4656420/+files/trusty_isc-dhcp_4.2.4-7ubuntu12.6.debdiff

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

Okay, Tks Talat.

Ill propose this fix into all versions relying on the IB patches
submitted in fix:

https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1401141

Check:

https://bugs.launchpad.net/ubuntu/+source/isc-
dhcp/+bug/1401141/comments/31

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Talat Batheesh]

Hi Rafael,
Thank you for the great job.
The Broadcast flag is working, the packet drop was in the switch.
We will ask our costumer to install this PPA, will update later.

Thank you,
Talat

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

The PPA for tests is:

https://launchpad.net/~inaddy/+archive/ubuntu/lp1529815

$ sudo add-apt-repository ppa:inaddy/lp1529815
$ sudo apt-get update && sudo apt-get dist-upgrade

Using a versioning schema that will be superseded by the final SRU.

PS: I'm also attaching the Trusty debdiff if this PPA proves to work.

Thank you

Rafael

** Patch added: "trusty_isc-dhcp_4.2.4-7ubuntu12.5.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1529815/+attachment/4568495/+files/trusty_isc-dhcp_4.2.4-7ubuntu12.5.debdiff

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

[Louis Bouchard]

** Also affects: isc-dhcp (Ubuntu Xenial)
   Importance: Undecided
 Assignee: Rafael David Tinoco (inaddy)
   Status: In Progress

** Also affects: isc-dhcp (Ubuntu Wily)
   Importance: Undecided
   Status: New

** Also affects: isc-dhcp (Ubuntu Trusty)
   Importance: Undecided
   Status: New

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

[Rafael David Tinoco]

** Attachment added: "dhcpd.conf"
   
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1529815/+attachment/4568546/+files/dhcpd.conf

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

[Rafael David Tinoco]

** Attachment added: "dhclient.conf"
   
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1529815/+attachment/4568545/+files/dhclient.conf

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

[Rafael David Tinoco]

** Patch removed: "trusty_isc-dhcp_4.2.4-7ubuntu12.5.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1529815/+attachment/4568495/+files/trusty_isc-dhcp_4.2.4-7ubuntu12.5.debdiff

** Patch added: "trusty_isc-dhcp_4.2.4-7ubuntu12.5.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1529815/+attachment/4568523/+files/trusty_isc-dhcp_4.2.4-7ubuntu12.5.debdiff

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

[Rafael David Tinoco]

** Changed in: isc-dhcp (Ubuntu Trusty)
   Status: New => In Progress

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

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

[Rafael David Tinoco]

Last test I did was to see if IB DHCP would get the BROADCAST flag on IB
interfaces. It did. Now, I removed:

ip->client->config->bootp_broadcast_always = 1;

from setup_ib_interface (when preparing for DHCP REQUEST), so I could
check if the option:

bootp-broadcast-always

from the config file (added by this patch also) to check if it makes a
difference.



## without bootp-broadcast-always

tcpdump: listening on ib0, link-type LINUX_SLL (Linux cooked), capture size 
65535 bytes
13:34:47.376362 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 0x5f7f9774, Flags [none] (0x)
  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

## with bootp-broadcast-always

13:51:10.735292 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 0x5bbf492d, 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



So the following statement in dhclient.conf

interface "ib0" {
send dhcp-client-identifier = "80:00:00:48:FE:80";
bootp-broadcast-always;
}

Is working good also.

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

[Ubuntu Foundations Team Bug Bot]

The attachment "trusty_isc-dhcp_4.2.4-7ubuntu12.5.debdiff" seems to be a
debdiff.  The ubuntu-sponsors team has been subscribed to the bug report
so that they can review and hopefully sponsor the debdiff.  If the
attachment isn't a patch, please remove the "patch" flag from the
attachment, remove the "patch" tag, and if you are member of the
~ubuntu-sponsors, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by
~brian-murray, for any issue please contact him.]

** Tags added: patch

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

[Mathew Hodson]

** Changed in: isc-dhcp (Ubuntu Trusty)
   Importance: Undecided => Medium

** Changed in: isc-dhcp (Ubuntu Wily)
   Importance: Undecided => Medium

** Changed in: isc-dhcp (Ubuntu Xenial)
   Importance: Undecided => Medium

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

[Rafael David Tinoco]

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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Title:
  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

** Changed in: isc-dhcp (Ubuntu)
   Status: Confirmed => In Progress

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Title:
  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

## RHEL broadcast flag set during DHCP DISCOVER: 
(this will tell DHCP server that DHCP response should come as a broadcast BOOT 
REPLY)

12:29:42.653772 IP (tos 0x0, ttl 128, id 16963, offset 0, flags [none], proto 
UDP (17), length 341)
0.0.0.0.68 > 255.255.255.255.67: [no cksum] BOOTP/DHCP, Request, length 
313, htype 32, hlen 0, xid 0x1f49749f, secs 1024, Flags [Broadcast] (0x8000)
  Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 9: "l-supp-22"
Vendor-Class Option 60, length 8: "MSFT 5.0"
Parameter-Request Option 55, length 13:
  Subnet-Mask, Domain-Name, Default-Gateway, Domain-Name-Server
  Netbios-Name-Server, Netbios-Node, Netbios-Scope, Router-Discovery
  Static-Route, Classless-Static-Route, 
Classless-Static-Route-Microsoft, Option 252
  Vendor-Option
Client-ID Option 61, length 20: hardware-type 255, 
00:00:00:00:00:02:00:00:02:c9:00:00:02:c9:03:00:fc:78:32
END Option 255, length 0
TTL Option 23, length 0
PAD Option 0, length 0, occurs 6
T254 Option 254, length 128: [|rfc1048 128]

## UBUNTU broadcast flag not set during DHCP DISCOVER

06:42:18.949401 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 0x52bc6268, secs 17, Flags [none] (0
x)
  Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Lease-Time Option 51, length 4: 86400
Parameter-Request Option 55, length 7:
  Subnet-Mask, BR, Time-Zone, Default-Gateway
  Domain-Name, Domain-Name-Server, Hostname
Client-ID Option 61, length 20: hardware-type 255, 
00:00:00:00:00:02:00:00:02:c9:00:f4:52:14:03:00:33:d1:91
END Option 255, length 0
PAD Option 0, length 0, occurs 19

** Changed in: isc-dhcp (Ubuntu)
 Assignee: (unassigned) => Rafael David Tinoco (inaddy)

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Title:
  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

RFC 4390 from 2006:

https://tools.ietf.org/html/rfc4390
(Dynamic Host Configuration Protocol (DHCP) over InfiniBand) also stipulates:

As described above, the link-layer address is unavailable to the DHCP
   server because the link-layer address is larger than the "chaddr"
   field length.  As a result, the server cannot unicast its reply to
   the client.  Therefore, a DHCP client MUST request that the server
   send a broadcast reply by setting the BROADCAST flag when IPoIB
   Address Resolution Protocol (ARP) is not possible, i.e., in
   situations where the client does not know its IP address.

   [RFC1542] discourages the use of a broadcast reply.  But in the case
   of IPoIB, this is a necessity because the server does not receive the
   link-layer address.

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

I think during the fix of:

https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1401141

I accidentally missed the following:

> + /* Set the broadcast flag */
> + ip->client->config->bootp_broadcast_always = 1;
> +

in find_subnet.

This comes from: dhcp-4.2.5-lpf-ib.patch in tag "dhcp-4.2.5-30.fc20" from
pkgs.fedoraproject.org/git/rpms/dhcp.git (since all IB patches are coming
from fedora project).

I'll review this and provide a PPA, asking for feedback.

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Title:
  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

As David stated,

Per RFC 1541:

https://tools.ietf.org/html/rfc1541

"DHCP uses the 'flags' field [21].  The leftmost bit is defined as the
BROADCAST (B) flag"

Taking us to RFC 1542:

https://tools.ietf.org/html/rfc1542

3.1 Client use of the 'flags' field

3.1.1 The BROADCAST flag

   Normally, BOOTP servers and relay agents attempt to deliver BOOTREPLY
   messages directly to a client using unicast delivery.  The IP
   destination address (in the IP header) is set to the BOOTP 'yiaddr'
   address and the link-layer destination address is set to the BOOTP
   'chaddr' address.  Unfortunately, some client implementations are
   unable to receive such unicast IP datagrams until they know their own
   IP address (thus we have a "chicken and egg" issue).  Often, however,
   they can receive broadcast IP datagrams (those with a valid IP
   broadcast address as the IP destination and the link-layer broadcast
   address as the link-layer destination).

   If a client falls into this category, it SHOULD set (to 1) the
   newly-defined BROADCAST flag in the 'flags' field of BOOTREPLY
   messages it generates.  This will provide a hint to BOOTP servers and
   relay agents that they should attempt to broadcast their BOOTREPLY
   messages to the client.

   If a client does not have this limitation (i.e., it is perfectly able
   to receive unicast BOOTREPLY messages), it SHOULD NOT set the
   BROADCAST flag (i.e., it SHOULD clear the BROADCAST flag to 0).

  DISCUSSION:

 This addition to the protocol is a workaround for old host
 implementations.  Such implementations SHOULD be modified so
 that they may receive unicast BOOTREPLY messages, thus making
 use of this workaround unnecessary.  In general, the use of
 this mechanism is discouraged.

I'll check DHCP IB implementation from my previous SRU from:

https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1401141

For this BROADCAST flag distinction on IB DHCP requests.

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

Continuation of RFC 1541 is RFC 2131:

https://tools.ietf.org/html/rfc2131 (adding DHCP INFORM msg type)

RFC 4390 from 2006:

https://tools.ietf.org/html/rfc4390
(Dynamic Host Configuration Protocol (DHCP) over InfiniBand) stipulates:

2.2.  Use of the BROADCAST flag

   A DHCP client on IPoIB MUST set the BROADCAST flag in DHCPDISCOVER
   and DHCPREQUEST messages (and set "ciaddr" to zero) to ensure that
   the server (or the relay agent) broadcasts its reply to the client.

   Note: As described in [RFC2131], "ciaddr" MUST be filled in with the
 client's IP address during BOUND, RENEWING or REBINDING states;
 therefore, the BROADCAST flag MUST NOT be set.  In these cases,
 the DHCP server unicasts DHCPACK message to the address in
 "ciaddr".  The link address will be resolved by ARP.

Meaning that, during discovery, specifically for InfiniBand, the BROADCAST
flag must be turned on (MUST is used in RFC).

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Rafael David Tinoco]

Okay, I just provisioned 2 servers (ConnectX-3 & ConnectX-4) so I could
reproduce this issue and work on it. I'll try to start reproducing the
issue now.

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[David Duffey]

When reading the RFC it appears the broadcast bit specifies to the
server how the client wants the server to respond.  I have a few
requests:

1. Can you create pcaps in Ubuntu / RHEL with various settings (like
always broadcast on and off) so we can compare the behaviour and packet
changes

2. Is DHCP (program/code) on other treating IB differently (i.e. find
the code/patch and does it do a 'if IB broadcast, else unicast reuest"

3. Can you point to other bug fixes you might have found for this?

I found via google someone doing the following:

interface "ethX" {
   supersede dhcp-server-identifier 255.255.255.255;
}

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  InfiniBand DHCP flow with PRA and DHCP relay not working

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

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: isc-dhcp (Ubuntu)
   Status: New => Confirmed

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

[David Duffey]

Actually, In #5 said this feature was added in isc v5, but that is not correct. 
 Current upstream doesn't have broadcast flag settings.

https://source.isc.org/cgi-bin/gitweb.cgi?p=dhcp.git;a=summary

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

[David Duffey]

Just a couple of other data points.

It looks like dhclient added the broadcast request flag functionality in
v5 (development release).

14.04 ships with 4.2
16.04 ships with 4.3 (the latest stable release)

Do we know if the user is using dhclient, or networkmanager or if either
client is acceptable?  This feature was added at different times for
different dhcp clients.  Can we get a package name for the dhcp client
being used?

David

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

[Talat Batheesh]

This is pacp for other vendor

** Attachment added: "rhel_discover.pcap"
   
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1529815/+attachment/4541720/+files/rhel_discover.pcap

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