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It is possible to add an instance to multiple networks. This would give the instance multiple fixed addresses to which you can assign floating IP addresses. This seems to be the only way, although it requires you to set up routers and subnets for each new network. That seems to be the only way to get multiple fixed IP addresses straight from Horizon. There might another way using nova/neutron CLI.

It is possible to add an instance to multiple networks. This would give the instance multiple fixed addresses to which you can assign floating IP addresses. This seems to be the only way, although it requires you to set up routers and subnets for each new network. network.

That seems to be the only way to get multiple fixed IP addresses straight from Horizon. There might another way using nova/neutron CLI.

CLI. You can try using quantum floatingip-associate.

It takes two arguments:

positional arguments:
  FLOATINGIP_ID         ID of the floating IP to associate
  PORT                  ID or name of the port to be associated with the
                        floatingip

So you would put the floating IP ID as a first argument (find it first by quantum floatingip-list) and the port as second (find it with quantum port-list").