mikaela.github.io/n/annoying-ports.md

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The following list is based on my other notes and /usr/lib/firewalld/services/

• mosh: UDP ports 60000-61000
• KDE Connect: TCP & UDP ports 1714-1764

Services doing it right?

<?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>

Note the destinations! Maybe I should copy that for some of my services like NTP.