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## Description
The upnp example showcases how to use the upnp network behaviour to externally open ports on the network gateway.
## Usage
To run the example, follow these steps:
1. In a terminal window, run the following command:
```sh
cargo run
```
2. This command will start the swarm and print the `NewExternalAddr` if the gateway supports `UPnP` or
`GatewayNotFound` if it doesn't.
## Conclusion
The upnp example demonstrates the usage of **libp2p** to externally open a port on the gateway if it
supports [`UPnP`](https://en.wikipedia.org/wiki/Universal_Plug_and_Play).
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