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fix typo in swarm tutorial

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lj8930 2017-01-17 11:24:55 +08:00 committed by GitHub
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@ -114,8 +114,8 @@ The following ports must be available. On some systems, these ports are open by
* **TCP** and **UDP port 4789** for overlay network traffic
If you are planning on creating an overlay network with encryption (`--opt encrypted`),
you will also need to ensure protocol 50 (ESP) is open.
you will also need to ensure port 50 (ESP) is open.
## What's next?
After you have set up your environment, you are ready to [create a swarm](create-swarm.md).
After you have set up your environment, you are ready to [create a swarm](create-swarm.md).