Unable to Attach Floating IP to Instance: "External Network Not Reachable from Subnet

Problem

• A floating IP is unable to be attached to an instance.

• The following error is observed in Clarity UI when attempting to attach the floating IP.

Environment

• Platform9 Managed OpenStack - All Versions

• Neutron

Causes

• No router has been created and associated with the subnet.

• Router associated with subnet, but isn't connected to external network.

• Router isn't connected to internal subnet, but has an external gateway.

Resolution

No Router Has Been Created

1. For guidance with creating a router, refer to Create Router in our networking guide.

Subnet Not Associated with Router

1. In Clarity UI, navigate to "Networks" > "Routers".

2. Click on the desired router.

   • Note: Ensure you are scoped to the appropriate tenant to be able to view the router.

3. Navigate to the "Interfaces" tab.

4. Click "+ Create New Interface".

5. Select the desired subnet.

6. Click "Add Interface".

Router Has No External Gateway

1. In Clarity UI, navigate to "Networks" > "Routers".

2. Click on the radio button for the desired router.

3. Click "Edit Router".

4. Select an external network from the "Set External Network" dropdown.

5. Click "Update Router".