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[OpenStack Infra <1415221@xxxxxxxxxxxxxxxxxx>]

Fix proposed to branch: master
Review: https://review.openstack.org/150595

** Changed in: neutron
       Status: Opinion => In Progress

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https://bugs.launchpad.net/bugs/1415221

Title:
  dhcp lease default is unfathomably large

Status in OpenStack Neutron (virtual network service):
  In Progress

Bug description:
  The default lease time Neutron sets right now for the DHCP agent is
  86400. This means that changing the IP of a VM's port could make it
  unreachable for up to 12 hours (assuming it sends a DHCP request at
  half-lease intervals) because the iptables rules are immediately
  updated to only match the new address even though the client is using
  the old address.

  Restarting the VM in this case sucks. Logging into the VM via the
  console is okay as long as password based logins are still enabled,
  but that's still not scriptable.

  IMO this lease time is too large for networks that could have very
  dynamic life-cycles with regards to addressing.

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