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<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>Precision Time Protocol (PTP) Master</short>
  <description>The Precision Time Protocol (PTP) allows to
synchronize computers to a time master. Enable this option, if you are
providing a PTP master. You need the linuxptp package installed for this
option to be useful.</description>
  <port protocol="udp" port="319"/>
  <port protocol="udp" port="320"/>
</service>