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Lighthouses are responsible for keeping track of all of the other hosts and helping them find each other within a Managed Nebula network, anywhere in the world. A lighthouse is the only node in a Managed Nebula network whose IP should not change. Running a lighthouse requires very few compute resources, and you can easily use the least expensive option from a cloud hosting provider. A UDP port (default 4242, configurable when creating the lighthouse) should be opened to the internet so that hosts can communicate with the lighthouse.