This script is Copyright (C) 2006-2011 Tenable Network Security, Inc.
The remote host answers to ICMP 'domain name' messages.
The remote host answered to an ICMP 'Domain Name Request'
as defined in RFC 1788.
Such a request is designed to obtain the DNS name of a host
based on its IP.
See also :
If you do not use this feature, filter out incoming ICMP packets
of type 37 and outgoing ICMP packets of type 38.
Risk factor :