The configuration supports multiple VXLAN self-service networks. For
simplicity, the following procedure creates one self-service network and
a router with a gateway on the flat provider network. The router uses
NAT for IPv4 network traffic and directly routes IPv6 network traffic.

.. note::

   IPv6 connectivity with self-service networks often requires addition of
   static routes to nodes and physical network infrastructure.

#. Source the administrative project credentials.
#. Update the provider network to support external connectivity for
   self-service networks.

   .. code-block:: console

      $ openstack network set --external provider1

   .. note::

      This command provides no output.

#. Source a regular (non-administrative) project credentials.
#. Create a self-service network.

   .. code-block:: console

      $ openstack network create selfservice1
      +-------------------------+--------------+
      | Field                   | Value        |
      +-------------------------+--------------+
      | admin_state_up          | UP           |
      | mtu                     | 1450         |
      | name                    | selfservice1 |
      | port_security_enabled   | True         |
      | router:external         | Internal     |
      | shared                  | False        |
      | status                  | ACTIVE       |
      +-------------------------+--------------+

   .. note::

      If you are using an MTU value on your network below 1280, please
      read the warning listed in the
      `IPv6 configuration guide <../config-ipv6.html#project-network-considerations>`__
      before creating any subnets.

#. Create a IPv4 subnet on the self-service network.

   .. code-block:: console

      $ openstack subnet create --subnet-range 192.0.2.0/24 \
        --network selfservice1 --dns-nameserver 8.8.4.4 selfservice1-v4
      +-------------------+---------------------------+
      | Field             | Value                     |
      +-------------------+---------------------------+
      | allocation_pools  | 192.0.2.2-192.0.2.254     |
      | cidr              | 192.0.2.0/24              |
      | dns_nameservers   | 8.8.4.4                   |
      | enable_dhcp       | True                      |
      | gateway_ip        | 192.0.2.1                 |
      | ip_version        | 4                         |
      | name              | selfservice1-v4           |
      +-------------------+---------------------------+

#. Create a IPv6 subnet on the self-service network.

   .. code-block:: console

      $ openstack subnet create --subnet-range fd00:192:0:2::/64 --ip-version 6 \
        --ipv6-ra-mode slaac --ipv6-address-mode slaac --network selfservice1 \
        --dns-nameserver 2001:4860:4860::8844 selfservice1-v6
      +-------------------+------------------------------------------------------+
      | Field             | Value                                                |
      +-------------------+------------------------------------------------------+
      | allocation_pools  | fd00:192:0:2::2-fd00:192:0:2:ffff:ffff:ffff:ffff     |
      | cidr              | fd00:192:0:2::/64                                    |
      | dns_nameservers   | 2001:4860:4860::8844                                 |
      | enable_dhcp       | True                                                 |
      | gateway_ip        | fd00:192:0:2::1                                      |
      | ip_version        | 6                                                    |
      | ipv6_address_mode | slaac                                                |
      | ipv6_ra_mode      | slaac                                                |
      | name              | selfservice1-v6                                      |
      +-------------------+------------------------------------------------------+

#. Create a router.

   .. code-block:: console

      $ openstack router create router1
      +-----------------------+---------+
      | Field                 | Value   |
      +-----------------------+---------+
      | admin_state_up        | UP      |
      | name                  | router1 |
      | status                | ACTIVE  |
      +-----------------------+---------+

#. Add the IPv4 and IPv6 subnets as interfaces on the router.

   .. code-block:: console

      $ openstack router add subnet router1 selfservice1-v4
      $ openstack router add subnet router1 selfservice1-v6

   .. note::

      These commands provide no output.

#. Add the provider network as the gateway on the router.

   .. code-block:: console

      $ openstack router set --external-gateway provider1 router1
