[Bug 1582163] [NEW] DHClient Not Acquiring New Lease After Disconnecting and Reconnecting Ethernet cable

[Hagen Kuehn]

Public bug reported:

isc-dhclient-4.3.3 does not acquire a new DHCP lease when the Ethernet
cable was disconnected and reconnected.

This problem is observed with Ubuntu 16.04 whereas it's working with
Ubuntu 14.04 (i.e. isc-dhclient-4.2.4).

The Problem:
When using Virtualbox 5.0.20 and Vagrant 1.8.1, SSH connection fails after the Ubuntu 16.04 VM was suspended and then started again from the saved state.

As of this Virtualbox bug https://www.virtualbox.org/ticket/15412 it
appears from Virtualbox 5.0.20 onwards, Virtualbox disconnects the
Ethernet cable for 5 seconds in order to trigger a DHCP lease request.
Since this is not the case with isc-dhclient-4.3.3 on Ubuntu 16.04 any
more, Virtualbox is waiting for network traffic endlessly in order to
infer the IP address of the VM, which is in turn required for Virtualbox
NAT Forwarding to work.

External associated bugs:
https://www.virtualbox.org/ticket/15412
https://github.com/mitchellh/vagrant/issues/7306

** Affects: isc-dhcp (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1582163

Title:
  DHClient Not Acquiring New Lease After Disconnecting and Reconnecting
  Ethernet cable

Status in isc-dhcp package in Ubuntu:
  New

Bug description:
  isc-dhclient-4.3.3 does not acquire a new DHCP lease when the Ethernet
  cable was disconnected and reconnected.

  This problem is observed with Ubuntu 16.04 whereas it's working with
  Ubuntu 14.04 (i.e. isc-dhclient-4.2.4).

  The Problem:
  When using Virtualbox 5.0.20 and Vagrant 1.8.1, SSH connection fails after the Ubuntu 16.04 VM was suspended and then started again from the saved state.

  As of this Virtualbox bug https://www.virtualbox.org/ticket/15412 it
  appears from Virtualbox 5.0.20 onwards, Virtualbox disconnects the
  Ethernet cable for 5 seconds in order to trigger a DHCP lease request.
  Since this is not the case with isc-dhclient-4.3.3 on Ubuntu 16.04 any
  more, Virtualbox is waiting for network traffic endlessly in order to
  infer the IP address of the VM, which is in turn required for
  Virtualbox NAT Forwarding to work.

  External associated bugs:
  https://www.virtualbox.org/ticket/15412
  https://github.com/mitchellh/vagrant/issues/7306

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