Linux vacca.o2switch.net 4.18.0-553.123.2.lve.el8.x86_64 #1 SMP Thu May 7 23:17:13 UTC 2026 x86_64

//lib/firewalld/services/ntp.xml

 <?xml version="1.0" encoding="utf-8"?>
<service>
  <short>Network Time Protocol (NTP) Server</short>
  <description>The Network Time Protocol (NTP) allows to synchronize computers to a time server. Enable this option, if you are providing a NTP server. You need the ntp or chrony package installed for this option to be useful.</description>
  <port protocol="udp" port="123"/>
</service>