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Description of problem:
dhcp_release which is part of dnsmasq works only for IPv4 addresses.
For IPv6 addresses, a new utility named, dhcp_release6, is added and is available in stock dnsmasq[1] version 2.76

OpenStack Neutron dhcp-agent invokes [1] dhcp_release6 utility for releasing IPv6 addresses and this feature will be part of OpenStack Newton release (i.e., OSP10). 
This bug is to have the necessary platform support for using dhcp_release6 on RHEL platform.

[1] http://www.thekelleys.org.uk/dnsmasq/CHANGELOG
[2] https://review.openstack.org/#/c/301747/

Additional info:
A missing dhcp_release6 utility will not have impact on IPv4 use-cases but will affect the IPv6 dhcpv6-stateful subnet use-cases.

To clarify, RHOSP 10 is planned to be shipped on top of RHEL 7.3.

@Pavel, can you please review this bug? This is pretty important to us on the OpenStack side as this could break our support for IPv6.


Thanks,
Nir

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:2117