File: //lib/firewalld/icmptypes/neighbour-solicitation.xml
<?xml version="1.0" encoding="utf-8"?>
<icmptype>
<short>Neighbour Solicitation (Neighbor Solicitation)</short>
<description>This informational message is sent by a node to determine the link-layer address of a neighbor, or to verify that a neighbor is still reachable via a cached link-layer address. Neighbor Solicitations are also used for Duplicate Address Detection.</description>
<destination ipv4="no"/>
<destination ipv6="yes"/>
</icmptype>