neutron/releasenotes/notes/add-dhcp_release6-ff1b8d62f...

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---
prelude: >
- Call dhcp_release6 command line utility when releasing
unused IPv6 leases for DHCPv6 stateful subnets.
dhcp_release6 first appeared in dnsmasq 2.76
upgrade:
- A version of dnsmasq that includes dhcp_release6 should
be installed on systems running the DHCP agent. Failure
to do this could cause DHCPv6 stateful addressing to
not function properly.
- The rootwrap filters file dhcp.filters must be updated
to include dhcp_release6, otherwise trying to run the
utility will result in a NoFilterMatched exception.
issues:
- Absence of dhcp_release6 when DHCPv6 stateful addressing
is in use may lead to bug `1521666 <https://bugs.launchpad.net/neutron/+bug/1521666>`_.
Neutron supports dhcp_release6 now, but if the tool is
not available this leads to increased log warnings. Read
bug report `1622002 <https://bugs.launchpad.net/neutron/+bug/1622002>`_
for more details.