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firewalld
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services
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<?xml version="1.0" encoding="utf-8"?> <service> <short>DNS</short> <description>The Domain Name System (DNS) is used to provide and request host and domain names. Enable this option, if you plan to provide a domain name service (e.g. with bind).</description> <port protocol="tcp" port="53"/> <port protocol="udp" port="53"/> </service>