Linux tonic.o2switch.net 4.18.0-553.30.1.lve.el8.x86_64 #1 SMP Tue Dec 3 01:21:19 UTC 2024 x86_64

//lib/firewalld/services/dhcpv6.xml

 <?xml version="1.0" encoding="utf-8"?>
<service>
  <short>DHCPv6</short>
  <description>This allows a DHCPv6 server to accept messages from DHCPv6 clients and relay agents.</description>
  <port protocol="udp" port="547"/>
</service>