Hello Jason,

You can use arpwatch ( ftp://ftp.ee.lbl.gov/arpwatch.tar.gz) to monitor your
network for ARP changes. It will build a database named arp.dat with all IPs
and their MAC Address. You can use arping too, to check if the mac address
are still on, for example.

---
Osvaldo J. Filho - Security Analyst
Unix, Network Devices and viruses specialist.
ActiveSec Information Security - http://www.activesec.com
---
----- Original Message -----
From: "Jason Lewis" <jlewispacketnexus.com>
To: <pen-testsecurityfocus.com>
Sent: Tuesday, February 04, 2003 8:36 PM
Subject: Using ARP to map a network
> I have searched and can't seem to find any tools to help map a network
> based on ARP tables.
>
> It seems to me, I could take ARP tables from several machines and build a
> network map.  If machines were behind a router the ARP tables would show
> multiple IP's with the same MAC.  With enough ARP tables, wouldn't I be
> able to build a map?
>
> Is my theory flawed?
>
> My goal is to do passive network mapping based on any local information I
> can obtain from computers or network devices.  Anyone have any ideas?
>
> jas
>
>
>
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