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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: neutron
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1281916

Title:
  OpenStack cannot assign IPv6 address to instance via dnsmasq
  dhcpserver

Status in OpenStack Neutron (virtual network service):
  Fix Released

Bug description:
  Use dnsmasq as dhcp server, OpenStack deploy one instance, we found
  the deployed instance cannot get the targeted IPv6 address, but it can
  get the targeted IPv4 address.

  At the earlier time, I found this issue when use Vmware vcenter
  driver, today I also found this issue is Linux env.

  I use dnsmasq as dhcpv6 server, use 'tcpdump -i tapXXXX' to monitor
  the network data,  and in deployed instance, and run "dhclient -6",
  the result of tcpdump as below:

    22:02:54.354287 IP6 fe80::f816:3eff:fe34:a80e.dhcpv6-client > ff02::1:2.dhcpv6-server: dhcp6 solicit
    22:02:54.354689 IP6 fe80::184d:82ff:fec4:d268.dhcpv6-server > fe80::f816:3eff:fe34:a80e.dhcpv6-client: dhcp6 advertise
    22:02:55.434954 IP6 fe80::f816:3eff:fe34:a80e.dhcpv6-client > ff02::1:2.dhcpv6-server: dhcp6 solicit
    22:02:55.435283 IP6 fe80::184d:82ff:fec4:d268.dhcpv6-server > fe80::f816:3eff:fe34:a80e.dhcpv6-client: dhcp6 advertise
    22:02:57.587164 IP6 fe80::f816:3eff:fe34:a80e.dhcpv6-client > ff02::1:2.dhcpv6-server: dhcp6 solicit
    22:02:57.587456 IP6 fe80::184d:82ff:fec4:d268.dhcpv6-server > fe80::f816:3eff:fe34:a80e.dhcpv6-client: dhcp6 advertise
    22:02:59.354082 IP6 fe80::184d:82ff:fec4:d268 > fe80::f816:3eff:fe34:a80e: ICMP6, neighbor solicitation, who has fe80::f816:3eff:fe34:a80e, length 32
    22:02:59.354922 IP6 fe80::f816:3eff:fe34:a80e > fe80::184d:82ff:fec4:d268: ICMP6, neighbor advertisement, tgt is fe80::f816:3eff:fe34:a80e, length 24

  from dnsmasq log, I got "no address available" error.

  The root cause is dnsmasq need to read host file, and distinguish MAC
  addresses from IPv6 addresses.

  the current host file as below:

  fa:16:3e:25:f4:31,host-2001-2011-0-f104--3.openstacklocal,
  2001:2011:0:f104::3

  We need to wrap the ipv6 address with '[]' to let dnsmasq can
  distinguish MAC addresses from IPv6 addresses.

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