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Full Discussion: ping
Top Forums UNIX for Dummies Questions & Answers ping Post 32981 by BSeanD on Thursday 12th of December 2002 04:56:31 AM
Old 12-12-2002
I'm not sure its as easy as that. I remember when I was using Linux I was able to block pings being returned giving the impression the machine was down/non-existant. I'm guessing you can do that in almost any OS.

You'd want to scan a system with something like nmap, if your using Unix, but of course that sort of thing is frowned upon if it's not your own machine. Smilie
 

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GENLIST.MAN.1(1p)					User Contributed Perl Documentation					 GENLIST.MAN.1(1p)

NAME
Genlist - ping scanner SYNOPSIS
genlist [Input Type] [Scan Options] [General Options] DESCRIPTION
Genlist is a program that returns a list of hosts that responding to ping probes. Thus, this list can be used to perform an scan of these machines using PBNJ or Nmap. Apart of PBNJ 2.0 suite of tools to monitor changes on a network. OPTIONS
Usage: genlist [Input Type] [General Options] Input Type: -s --scan <target> Ping Target Range ex: 10.0.0.* Scan Options: -n --nmap <path> Path to Nmap executable --inter <interface> Perform scan using non default interface General Options: -v --version Display version -h --help Display this information Send Comments to Joshua D. Abraham ( jabra@ccs.neu.edu ) EXAMPLE OF GENLIST USED WITH PBNJ
$ ./genlist -s 10.0.0.* > iplist $ sudo ./scanpbnj -i iplist EXAMPLE OF GENLIST USED WITH NMAP
$ ./genlist -s 10.0.0.* > iplist $ sudo ./nmap -iL iplist INPUT TYPE
-s <target> Ping Target Range ex: 10.0.0.* The ping scan is a useful method of only scanning the host that are responding to ICMP echo requests. This scan basically takes the host that respond to ping and prints them. This is useful in combining the result with a PBNJ or Nmap scan because no time is wasted in scanning hosts that do not respond. SCAN OPTIONS
--interface <intface> This option sets an alternative interface for performing the scan. This is useful when you have multiple interfaces on a machine with restrictions on which devices can access certain IP ranges. -n --nmap <path> Use an alternative Nmap rather than Nmap located in the your path. This is useful if you have multiple version of Nmap installed on a system or if you are testing a new version of Nmap. Remember that if you are using a newly compiled version of Nmap that you need to export NMAPDIR to the location that Nmap was compiled in. Thus, if you have compiled Nmap in your homedir, use the following notation to run it with Genlist: $ export NMAPDIR=$HOME/nmap-VERSION/ $ sudo genlist -s 10.0.0.* --nmap $HOME/nmap-VERISON/ General Options: -v --version Prints the Genlist version number and exits. -h --help Display this information Prints a short help screen with the most common command flags. Running Genlist without any arguments does the same thing. FEATURE REQUESTS
Any feature requests should be reported to the online feature-request-tracking system available on the web at : http://sourceforge.net/tracker/?func=add&group_id=149390&atid=774489 Before requesting a feature, please check to see if the features has already been requested. BUG REPORTS
Any bugs found should be reported to the online bug-tracking system available on the web at : http://sourceforge.net/tracker/?func=add&group_id=149390&atid=774488. Before reporting bugs, please check to see if the bug has already been reported. When reporting PBNJ bugs, it is important to include a reliable way to reproduce the bug, version number of PBNJ and Nmap, OS name and version, and any relevant hardware specs. And of course, patches to rectify the bug are even better. SEE ALSO
scanpbnj(1) outputpbnj(1), nmap(1) AUTHORS
Joshua D. Abraham ( jabra@ccs.neu.edu ) LEGAL NOTICES
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details at http://www.gnu.org/copyleft/gpl.html, or in the COPYING file included with PBNJ. It should also be noted that PBNJ has occasionally been known to crash poorly written applications, TCP/IP stacks, and even operating systems. While this is extremely rare, it is important to keep in mind. PBNJ should never be run against mission critical systems unless you are prepared to suffer downtime. We acknowledge here that PBNJ may crash your systems or networks and we disclaim all liability for any damage or problems PBNJ could cause. perl v5.8.8 2006-11-06 GENLIST.MAN.1(1p)
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