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$ pwd: /lib/firewalld/services/
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File: //lib/firewalld/services/nebula.xml
<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>Nebula</short>
  <description>Nebula is a scalable overlay networking tool with a focus on performance, simplicity and security. The port needs to be open if the host is set as lighthouse.</description>
  <port protocol="udp" port="4242"/>
</service>
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