[no subject]

> Right, I think I understand this.  But the flip side to this is that the
> attacker now knows that there is a machine there, whereas if you drop the
> packet, he doesn't know whether it is because of a firewall dropping packets
> or because it is an unused IP address.  If my assumption is correct, hackers
> are not going to want to investigate this further since it could be a waste
> of time.

Not exactly

You usually get an active response from somewhere for an unused IP address 
- things like ICMP host unreachables from the switch upstream, etc

later,
chris


</pre>
<!--X-Body-of-Message-End-->
<!--X-MsgBody-End-->
<!--X-Follow-Ups-->
<hr>
<ul><li><strong>Follow-Ups</strong>:
<ul>
<li><strong><a name="00228" href="msg00228.html">[ale] Nmap + filtered ports</a></strong>
<ul><li><em>From:</em> nym.bnm at gmail.com (Brian MacLeod)</li></ul></li>
</ul></li></ul>
<!--X-Follow-Ups-End-->
<!--X-References-->
<ul><li><strong>References</strong>:
<ul>
<li><strong><a name="00076" href="msg00076.html">[ale] Nmap + filtered ports</a></strong>
<ul><li><em>From:</em> cfowler at outpostsentinel.com (Christopher Fowler)</li></ul></li>
<li><strong><a name="00077" href="msg00077.html">[ale] Nmap + filtered ports</a></strong>
<ul><li><em>From:</em> jkinney at localnetsolutions.com (James P. Kinney III)</li></ul></li>
<li><strong><a name="00195" href="msg00195.html">[ale] Nmap + filtered ports</a></strong>
<ul><li><em>From:</em> transam at verysecurelinux.com (Bob Toxen)</li></ul></li>
<li><strong><a name="00206" href="msg00206.html">[ale] Nmap + filtered ports</a></strong>
<ul><li><em>From:</em> jasonday at worldnet.att.net (Jason Day)</li></ul></li>
<li><strong><a name="00207" href="msg00207.html">[ale] Nmap + filtered ports</a></strong>
<ul><li><em>From:</em> hbbs at comcast.net (Jeff Hubbs)</li></ul></li>
<li><strong><a name="00210" href="msg00210.html">[ale] Nmap + filtered ports</a></strong>
<ul><li><em>From:</em> jason.day at gmail.com (Jason Day)</li></ul></li>
<li><strong><a name="00212" href="msg00212.html">[ale] Nmap + filtered ports</a></strong>
<ul><li><em>From:</em> hbbs at comcast.net (Jeff Hubbs)</li></ul></li>
<li><strong><a name="00213" href="msg00213.html">[ale] Nmap + filtered ports</a></strong>
<ul><li><em>From:</em> kaboom at oobleck.net (Chris Ricker)</li></ul></li>
<li><strong><a name="00214" href="msg00214.html">[ale] Nmap + filtered ports</a></strong>
<ul><li><em>From:</em> nym.bnm at gmail.com (Brian MacLeod)</li></ul></li>
</ul></li></ul>
<!--X-References-End-->
<!--X-BotPNI-->
<ul>
<li>Prev by Date:
<strong><a href="msg00216.html">[ale] Cereal Box Advertising</a></strong>
</li>
<li>Next by Date:
<strong><a href="msg00217.html">[ale] Configuration Engineer position</a></strong>
</li>
<li>Previous by thread:
<strong><a href="msg00214.html">[ale] Nmap + filtered ports</a></strong>
</li>
<li>Next by thread:
<strong><a href="msg00228.html">[ale] Nmap + filtered ports</a></strong>
</li>
<li>Index(es):
<ul>
<li><a href="maillist.html#00215"><strong>Date</strong></a></li>
<li><a href="threads.html#00215"><strong>Thread</strong></a></li>
</ul>
</li>
</ul>

<!--X-BotPNI-End-->
<!--X-User-Footer-->
<!--X-User-Footer-End-->
</body>
</html>