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creation of IPV6 network

Hi,

I want to create and use the IPV6 network, I could create the subnet for both internal and external network and I could communicate between the VM's via IPV6 internal subnet pool IP's, however the external network IPV6 ip I am not able to ping.

    [root@controller ~]# neutron net-list
+--------------------------------------+--------+-----------------------------------------------------+
| id                                   | name   | subnets                                             |
+--------------------------------------+--------+-----------------------------------------------------+
| 8c2bd645-7783-4459-bd2d-83926aaf47ed | public | f382764a-4696-4264-be31-723b76789da2 2000:100::/64  |
|                                      |        | 884b7d56-df50-4416-af1a-eb65149adf70 10.19.147.0/24 |
| c9285dec-f4c6-490e-9965-a6b75392f976 | cf-net | 33144a58-7fcc-498f-b31b-76350b91234c 2000:200::/64  |
|                                      |        | ce333b88-d2ea-46c9-8c3c-14dfab4c5d82 192.168.1.0/24 |
+--------------------------------------+--------+-----------------------------------------------------+


    [root@controller ~]# neutron subnet-list
    +--------------------------------------+-----------------+----------------+----------------------------------------------------+
    | id                                   | name            | cidr           | allocation_pools                                   |
    +--------------------------------------+-----------------+----------------+----------------------------------------------------+
    | f382764a-4696-4264-be31-723b76789da2 | ext-subnet-Ipv6 | 2000:100::/64  | {"start": "2000:100::100", "end": "2000:100::200"} |
    | 884b7d56-df50-4416-af1a-eb65149adf70 | ext-subnet      | 10.19.147.0/24 | {"start": "10.19.147.13", "end": "10.19.147.50"}   |
    | 33144a58-7fcc-498f-b31b-76350b91234c | cf-subnet-ipv6  | 2000:200::/64  | {"start": "2000:200::100", "end": "2000:200::100"} |
    | ce333b88-d2ea-46c9-8c3c-14dfab4c5d82 | cf-subnet       | 192.168.1.0/24 | {"start": "192.168.1.2", "end": "192.168.1.254"}   |
    +--------------------------------------+-----------------+----------------+----------------------------------------------------+


[root@controller ~]# neutron subnet-show 33144a58-7fcc-498f-b31b-76350b91234c
+-------------------+----------------------------------------------------+
| Field             | Value                                              |
+-------------------+----------------------------------------------------+
| allocation_pools  | {"start": "2000:200::100", "end": "2000:200::100"} |
| cidr              | 2000:200::/64                                      |
| dns_nameservers   |                                                    |
| enable_dhcp       | True                                               |
| gateway_ip        | 2000:200::1                                        |
| host_routes       |                                                    |
| id                | 33144a58-7fcc-498f-b31b-76350b91234c               |
| ip_version        | 6                                                  |
| ipv6_address_mode | dhcpv6-stateless                                   |
| ipv6_ra_mode      | dhcpv6-stateless                                   |
| name              | cf-subnet-ipv6                                     |
| network_id        | c9285dec-f4c6-490e-9965-a6b75392f976               |
| tenant_id         | 4a7ff5975e01453fb6cc29ef75e5e8fd                   |
+-------------------+----------------------------------------------------+



[root@controller ~]# neutron subnet-show ext-subnet-Ipv6
+-------------------+----------------------------------------------------+
| Field             | Value                                              |
+-------------------+----------------------------------------------------+
| allocation_pools  | {"start": "2000:100::100", "end": "2000:100::200"} |
| cidr              | 2000:100::/64                                      |
| dns_nameservers   |                                                    |
| enable_dhcp       | True                                               |
| gateway_ip        |                                                    |
| host_routes       |                                                    |
| id                | f382764a-4696-4264-be31-723b76789da2               |
| ip_version        | 6                                                  |
| ipv6_address_mode | slaac                                              |
| ipv6_ra_mode      |                                                    |
| name              | ext-subnet-Ipv6                                    |
| network_id        | 8c2bd645-7783-4459-bd2d-83926aaf47ed               |
| tenant_id         | 4a7ff5975e01453fb6cc29ef75e5e8fd                   |
+-------------------+----------------------------------------------------+


[root@controller ~]# neutron router-list
+--------------------------------------+------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------+-------+
| id                                   | name       | external_gateway_info                                                                                                                                                                    | distributed | ha    |
+--------------------------------------+------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------+-------+
| 8540d694-1e5d-4021-9332-4e0275a129f9 | virtrouter | {"network_id": "8c2bd645-7783-4459-bd2d-83926aaf47ed", "enable_snat": true, "external_fixed_ips": [{"subnet_id": "884b7d56-df50-4416-af1a-eb65149adf70", "ip_address": "10.19.147.13"}]} | False       | False |
+--------------------------------------+------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------+-------+
[root@controller ~]#

I am not able to set the router interface with the IPV6 IP and hence I am not able to communicate to the VM via IPV6.

Can anyone let me know what changes need to be done. Please help