dhclient fail on InfiniBand HW

[Eyal Perry]

Issue description:
when running dhclient on IP-over-Infiniband interface the process immediately fails - no packets are sent at all.
Reproduction:
# dhclient -v ib0
Internet Systems Consortium DHCP Client 4.2.4
Copyright 2004-2012 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/ib0/
Sending on LPF/ib0/
Sending on Socket/fallback
xid: warning: no netdev with useable HWADDR found for seed's uniqueness enforcement
xid: rand init seed (0xd42bc663) built using gethostid
stgraber: host-name
dhcp-client-identifier must be specified for InfiniBand

Additional Host info:
# lsb_release -rd
Description: Ubuntu Trusty Tahr (development branch)
Release: 14.04
# apt-cache policy isc-dhcp-client
isc-dhcp-client:
  Installed: 4.2.4-7ubuntu8
  Candidate: 4.2.4-7ubuntu8
  Version table:
 *** 4.2.4-7ubuntu8 0
        500 http://il.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

[Stéphane Graber (stgraber)]

And what happens if you do set a dhcp-client-identifier as the error tells you to?

[Eyal Perry (eyalpe)]

It will send the DHCP request with that specified client-ID. But this approach requires net/sys-admin to reconfigure dhclient.conf in advance.