06-20-2014
Actually, nmap listens to ICMP during UDP scans primarily for ICMP unreachable messages. In theory, if you reach the system with a UDP packet, but the port the packet is addressed to is not listening, the system should discard the UDP packet and send an ICMP unreachable to the sender. The app can't see these messages, but an alert system administrator will notice them (remember we're talking theory here).
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LEARN ABOUT REDHAT
nmapfe
NMAPFE(1) General Commands Manual NMAPFE(1)
NAME
nmapfe (xnmap) - GTK+ graphical frontend to the Nmap Security Scanner
SYNOPSIS
nmapfe [ any Glib options such as --display ]
DESCRIPTION
Nmapfe (also known as xnmap) is a convenient X Window front end for the Nmap Security Scanner. Most of the options correspond directly to
Nmap options, which are described in detail in the Nmap man page. We recommend you read that first. There is also limited help available
via the NmapFE "Help" menu.
AUTHOR
NmapFE was originally written by Zach Smith <key@aye.net>
It is now maintained by Fyodor <fyodor@insecure.org>
Feel free to write me ( fyodor@insecure.org ) with questions or bug reports.
DISTRIBUTION
The newest version of nmapfe can be obtained from http://www.insecure.org/nmap/
nmapfe is (C) 1999, 2000 by Fyodor (fyodor@insecure.org)
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
the Free Software Foundation; Version 2. This guarantees your right to use, modify, and redistribute Nmap under certain conditions. If
this license is unacceptable to you, Insecure.Org may be willing to sell alternative licenses (contact fyodor@insecure.org ).
Source is provided to this software because we believe users have a right to know exactly what a program is going to do before they run it.
This also allows you to audit the software for security holes (none have been found so far).
Source code also allows you to port nmapfe to new platforms, fix bugs, and add new features. You are highly encouraged to send your
changes to Fyodor for possible incorporation into the main Nmap distribution. By sending these changes to Fyodor or nmap-hackers, it is
assumed that you are offering Fyodor the unlimited, non-exclusive right to reuse, modify, and relicense the code. If you wish to specify
special license conditions of your contributions, please state them up front.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MER-
CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details (it is in the COPYING file of the
nmap distribution).
It should also be noted that Nmap has been known to crash certain poorly written applications, TCP/IP stacks, and even operating systems.
Nmap should never be run against mission critical systems unless you are prepared to suffer downtime. We acknowledge here that Nmap may
crash your systems or networks and we disclaim all liability for any damage or problems Nmap could cause.
NMAPFE(1)