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[Wenxin Wang <stieizc.33@xxxxxxxxx>]

Public bug reported:

Currently, when an IPv6 subnet has ipv6_ra_mode set to DHCPV6_STATEFUL,
there will be no section in the relevant radvd config file about its
prefix. However, instances on that subnet still relies on RA for
settings that DHCPv6 does not provide, like prefix length, and the M
bit. As of the prefix length, it seems that currently neutron assumes a
/64 prefix (correct me if I'm wrong), but future version may need to
handle prefixes with different lengths.

** Affects: neutron
     Importance: Undecided
     Assignee: Wenxin Wang (stieizc-33)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1531093

Title:
  radvd config should have a prefix section when subnet's ipv6_ra_mode
  is DHCPV6_STATEFUL

Status in neutron:
  In Progress

Bug description:
  Currently, when an IPv6 subnet has ipv6_ra_mode set to
  DHCPV6_STATEFUL, there will be no section in the relevant radvd config
  file about its prefix. However, instances on that subnet still relies
  on RA for settings that DHCPv6 does not provide, like prefix length,
  and the M bit. As of the prefix length, it seems that currently
  neutron assumes a /64 prefix (correct me if I'm wrong), but future
  version may need to handle prefixes with different lengths.

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