@@ -404,16 +404,26 @@ provision the hosts are with Docker Machine.

 ![Engine on each host](images/engine_on_net.png)

+You should open the following ports between each of your hosts.

+

+| Protocol | Port | Description           |

+|----------|------|-----------------------|

+| udp      | 4789 | Data plane (VXLAN)    |

+| tcp/udp  | 7946 | Control plane         |

+

+Your key-value store service may require additional ports. 

+Check your vendor's documentation and open any required ports.

+

 Once you have several machines provisioned, you can use Docker Swarm to quickly

 form them into a swarm which includes a discovery service as well.

 To create an overlay network, you configure options on  the `daemon` on each

 Docker Engine for use with `overlay` network. There are two options to set:

-| Option                           | Description                                               |

-|----------------------------------|-----------------------------------------------------------|

-| `--cluster-store=PROVIDER://URL` | Describes the location of the KV service.               |

-| `--cluster-advertise=HOST_IP`    | Advertises containers created by the HOST on the network. |

+| Option                                        | Description                                                 |

+|-----------------------------------------------|-------------------------------------------------------------|

+| `--cluster-store=PROVIDER://URL`              | Describes the location of the KV service.                   |

+| `--cluster-advertise=HOST_IP|HOST_IFACE:PORT` | The IP address or interface of the HOST used for clustering |

 Create an `overlay` network on one of the machines in the Swarm.