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[yatin <1962306@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Steps to reproduce:-
Update ipv6_pd_enabled = true in neutron.conf and restart neutron-api service.

$ openstack network create ipv6-pd
$ openstack subnet create --ip-version 6 --ipv6-ra-mode slaac --ipv6-address-mode slaac --use-default-subnet-pool --network ipv6-pd ipv6-pd-1
$ openstack router add subnet router1 ipv6-pd-1

Add subnet fails with below Error:-
BadRequestException: 400: Client Error for url: http://192.168.0.5:9696/v2.0/routers/417bc2ad-019a-470c-b0ca-61a1d81c3d7d/add_router_interface, Bad router request: Subnet for router interface must have a gateway IP.

The issue is caused with https://review.opendev.org/c/openstack/neutron/+/699465 in order to fix 
https://bugs.launchpad.net/neutron/+bug/1856675.


Workaround:-
Create segment with --gateway specified, this will cause the issue #1856675 but working prefix-delegation, so need to fix it without re introducing previous bug:-
openstack subnet create --ip-version 6 --ipv6-ra-mode slaac --ipv6-address-mode slaac --use-default-subnet-pool --network ipv6-pd --gateway :: ipv6-pd-1

** Affects: neutron
     Importance: Undecided
     Assignee: yatin (yatinkarel)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => yatin (yatinkarel)

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https://bugs.launchpad.net/bugs/1962306

Title:
  [Prefix Delegation] router add segment fails with Subnet for router
  interface must have a gateway IP

Status in neutron:
  New

Bug description:
  Steps to reproduce:-
  Update ipv6_pd_enabled = true in neutron.conf and restart neutron-api service.

  $ openstack network create ipv6-pd
  $ openstack subnet create --ip-version 6 --ipv6-ra-mode slaac --ipv6-address-mode slaac --use-default-subnet-pool --network ipv6-pd ipv6-pd-1
  $ openstack router add subnet router1 ipv6-pd-1

  Add subnet fails with below Error:-
  BadRequestException: 400: Client Error for url: http://192.168.0.5:9696/v2.0/routers/417bc2ad-019a-470c-b0ca-61a1d81c3d7d/add_router_interface, Bad router request: Subnet for router interface must have a gateway IP.

  The issue is caused with https://review.opendev.org/c/openstack/neutron/+/699465 in order to fix 
  https://bugs.launchpad.net/neutron/+bug/1856675.

  
  Workaround:-
  Create segment with --gateway specified, this will cause the issue #1856675 but working prefix-delegation, so need to fix it without re introducing previous bug:-
  openstack subnet create --ip-version 6 --ipv6-ra-mode slaac --ipv6-address-mode slaac --use-default-subnet-pool --network ipv6-pd --gateway :: ipv6-pd-1

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