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 Basic L3 operations

External networks are visible to all users. However, the default policy settings enable only administrative users to create, update, and delete external networks.

This table shows example neutron commands that enable you to complete basic L3 operations:

Table 7.9. Basic L3 operations
Operation Command

Creates external networks.

# neutron net-create public --router:external True
$ neutron subnet-create public 172.16.1.0/24

Lists external networks.

$ neutron net-list -- --router:external True

Creates an internal-only router that connects to multiple L2 networks privately.

$ neutron net-create net1
$ neutron subnet-create net1 10.0.0.0/24
$ neutron net-create net2
$ neutron subnet-create net2 10.0.1.0/24
$ neutron router-create router1
$ neutron router-interface-add router1 SUBNET1_UUID
$ neutron router-interface-add router1 SUBNET2_UUID

Connects a router to an external network, which enables that router to act as a NAT gateway for external connectivity.

$ neutron router-gateway-set router1 EXT_NET_ID

The router obtains an interface with the gateway_ip address of the subnet and this interface is attached to a port on the L2 Networking network associated with the subnet. The router also gets a gateway interface to the specified external network. This provides SNAT connectivity to the external network as well as support for floating IPs allocated on that external networks. Commonly an external network maps to a network in the provider

Lists routers.

$ neutron router-list

Shows information for a specified router.

$ neutron router-show ROUTER_ID

Shows all internal interfaces for a router.

$ neutron router-port-list ROUTER_ID
$ neutron router-port-list ROUTER_NAME

Identifies the PORT_ID that represents the VM NIC to which the floating IP should map.

$ neutron port-list -c id -c fixed_ips -- --device_id INSTANCE_ID

This port must be on an Networking subnet that is attached to a router uplinked to the external network used to create the floating IP. Conceptually, this is because the router must be able to perform the Destination NAT (DNAT) rewriting of packets from the floating IP address (chosen from a subnet on the external network) to the internal fixed IP (chosen from a private subnet that is behind the router).

Creates a floating IP address and associates it with a port.

$ neutron floatingip-create EXT_NET_ID
$ neutron floatingip-associate FLOATING_IP_ID INTERNAL_VM_PORT_ID

Creates a floating IP address, and associates it with a port, in a single step.

$ neutron floatingip-create --port_id INTERNAL_VM_PORT_ID EXT_NET_ID

Lists floating IPs.

$ neutron floatingip-list

Finds floating IP for a specified VM port.

$ neutron floatingip-list -- --port_id ZZZ

Disassociates a floating IP address.

$ neutron floatingip-disassociate FLOATING_IP_ID

Deletes the floating IP address.

$ neutron floatingip-delete FLOATING_IP_ID

Clears the gateway.

$ neutron router-gateway-clear router1

Removes the interfaces from the router.

$ neutron router-interface-delete router1 SUBNET_ID

Deletes the router.

$ neutron router-delete router1
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