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$ pwd: /lib/firewalld/icmptypes/
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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>
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