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Update index.md 

fix the typo
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Bingshen Wang 2016-12-29 09:55:50 +08:00 committed by GitHub
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engine/userguide/networking/index.md
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@ -483,7 +483,7 @@ Your key-value store service may require additional ports.
Check your vendor's documentation and open any required ports.
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.
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.