How to Provide External Connectivity to Internal Networks

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Use this procedure to enable an internal network to access the wider public network. This procedure assumes that internal networks already exist for specific projects. To create a project internal network using the dashboard, see Creating Internal Networks for Projects.

Before You Begin

Before you proceed, obtain the subnet name that needs public access.

Set the global shell variables for Neutron.

controller# export OS_USERNAME=neutron
controller# export OS_PASSWORD=service-password
controller# export OS_TENANT_NAME=service
controller# export OS_AUTH_URL=http://$CONTROLLER_ADMIN_NODE:5000/v2.0

Identify the ID of the subnet that requires external access.
```
controller# neutron subnet-list | grep subnet-name
```
(Optional) Obtain the name of the router.
```
controller# neutron router-list
```

Add the subnet's ID as an interface to the router.

controller# neutron router-interface-add router-name subnetID

Example 3 Connecting an Internal Network to the External Network

This example uses the HR internal network that was created in How to Configure a Network for a Project. The HR network, whose subnet is HR_Subnet, requires access to the public network.

controller# neutron subnet-list | grep HR_Subnet
| b6feff42-36aa-4235- | HR_Subnet  | 10.132.20.0/24 | {"start": "10.132.20.2", |
|   9fe0-ac5de6b43af3 |            |                |  "end": "10.132.20.254"} |

controller# neutron router-list
+---------------------  +------------+--------------------------------+
| id                    | name       | external_gateway_info          |
+---------------------  +------------+--------------------------------+
| f89b24ed-42dd-48b0-   | ext-router | {"network_id": "6c4c1823-a203- |
|    8f4b-fd41887a3370  |            |    43b1-9674-ddb5ff4185fc",    |
|                       |            | "enable_snat": true,           |
|                       |            | "external_fixed_ips":          |
|                       |            | [{"subnet_id": "83d9b40f-cc61- |
|                       |            |    4696-b22e-b4cbc2aa3872",    |
|                       |            | "ip_address": "10.132.10.8"}]} |
+----------  -----------+------------+--------------------------------+

controller# neutron router-interface-add ext-router b6feff42-36aa-4235-9fe0-ac5de6b43af3
Added interface b6feff42-36aa-4235-9fe0-ac5de6b43af3 to router ext-router.