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File: //lib/firewalld/services/nfs3.xml
<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>NFS3</short>
  <description>The NFS3 protocol is used to share files. You will need to have the NFS tools installed and properly configure your NFS server for this option to be useful.</description>
  <port protocol="tcp" port="2049"/>
  <port protocol="udp" port="2049"/>
</service>