Create and manage networks

Create and manage networks The OpenStack Networking service provides a scalable system for managing the network connectivity within an OpenStack cloud deployment. It can easily and quickly react to changing network needs (for example, creating and assigning new IP addresses). Networking in OpenStack is complex. This section provides the basic instructions for creating a network and a router. For detailed information about managing networks, refer to the OpenStack Cloud Administrator Guide.

Create a network Log in to the dashboard, choose a project, and click Networks. Click Create Network. In the Create Network dialog box, specify the following values. Network tab Network Name Specify a name to identify the network. Subnet tab Create Subnet Select this check box to create a subnetYou do not have to specify a subnet when you create a network, but if you do not, any attached instance receives an Error status. Subnet Name Specify a name for the subnet. Network Address Specify the IP address for the subnet. IP Version Select IPv4 or IPv6. Gateway IP Specify an IP address for a specific gateway. This parameter is optional. Disable Gateway Select this check box to disable a gateway IP address. Subnet Detail tab Enable DHCP Select this check box to enable DHCP. Allocation Pools Specify IP address pools. DNS Name Servers Specify a name for the DNS server. Host Routes Specify the IP address of host routes. Click Create. The dashboard shows the network on the Networks tab.

Create a router Log in to the dashboard, choose a project, and click Routers. Click Create Router. In the Create Router dialog box, specify a name for the router and click Create Router. The new router is now displayed in the Routers tab. Click the new router's Set Gateway button. In the External Network field, specify the network to which the router will connect, and then click Set Gateway. To connect a private network to the newly created router, perform the following steps: On the Routers tab, click the name of the router. On the Router Details page, click Add Interface. In the Add Interface dialog box, specify the following information: Subnet Select a subnet. IP Address (optional) Enter the router interface IP address for the selected subnet. Note: If this value is not set, then by default, the first host IP address in the subnet is used by OpenStack Networking. The Router Name and Router ID fields are automatically updated. Click Add Interface. You have successfully created the router. You can view the new topology from the Network Topology tab.