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firewalld
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services
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<?xml version="1.0" encoding="utf-8"?> <service> <short>Multicast DNS (mDNS)</short> <description>mDNS provides the ability to use DNS programming interfaces, packet formats and operating semantics in a small network without a conventional DNS server. If you plan to use Avahi, do not disable this option.</description> <port protocol="udp" port="5353"/> <destination ipv4="224.0.0.251" ipv6="ff02::fb"/> </service>