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[Rodolfo Alonso <1980339@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Bugzilla reference: https://bugzilla.redhat.com/show_bug.cgi?id=2102211


Since [1] we can have IPv6 metadata. This is served via a link local address defined in neutron-lib [2].

However the DHCP agent is adding this IPv6 address to the DHCP namespace
using scope=global. Log [3] (NOTE: the first line of this log is an
extra debug line added to print the "add_ip_address" parameters passed).
In order to make this work, we should check the IPv6 scope and pass it
to the method.

[1]https://review.opendev.org/c/openstack/neutron/+/715482
[2]https://github.com/openstack/neutron-lib/blob/c8132ff1b06b0d9c50faa19d30f0346cb6a2eea9/neutron_lib/constants.py#L627
[3]https://paste.opendev.org/show/bjBibJe38eEGKdHdDn2y/

** Affects: neutron
     Importance: High
     Assignee: Rodolfo Alonso (rodolfo-alonso-hernandez)
         Status: New

** Changed in: neutron
   Importance: Undecided => High

** Changed in: neutron
     Assignee: (unassigned) => Rodolfo Alonso (rodolfo-alonso-hernandez)

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https://bugs.launchpad.net/bugs/1980339

Title:
  [DHCP] IPv6 metadata address fails when it's added to the interface

Status in neutron:
  New

Bug description:
  Bugzilla reference:
  https://bugzilla.redhat.com/show_bug.cgi?id=2102211

  
  Since [1] we can have IPv6 metadata. This is served via a link local address defined in neutron-lib [2].

  However the DHCP agent is adding this IPv6 address to the DHCP
  namespace using scope=global. Log [3] (NOTE: the first line of this
  log is an extra debug line added to print the "add_ip_address"
  parameters passed). In order to make this work, we should check the
  IPv6 scope and pass it to the method.

  [1]https://review.opendev.org/c/openstack/neutron/+/715482
  [2]https://github.com/openstack/neutron-lib/blob/c8132ff1b06b0d9c50faa19d30f0346cb6a2eea9/neutron_lib/constants.py#L627
  [3]https://paste.opendev.org/show/bjBibJe38eEGKdHdDn2y/

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