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- <li><em>date</em>: Fri, 16 Dec 2005 14:15:43 -0500</li>
- <li><em>from</em>: jasonday at worldnet.att.net (Jason Day)</li>
- <li><em>in-reply-to</em>: <<a href="msg00195.html">[email protected]</a>></li>
- <li><em>references</em>: <<a href="msg00076.html">[email protected]</a>> <<a href="msg00077.html">[email protected]</a>> <<a href="msg00195.html">[email protected]</a>></li>
- <li><em>subject</em>: [ale] Nmap + filtered ports</li>
I thought it was better to REJECT all that you don't allow, on the
grounds that that's the expected behavior for an unbound port.
In other words, if I REJECT packets to, say, port 25, then to an
attacker running a scan it looks like I don't have a daemon listening on
port 25. But if I DROP packets to port 25, then he knows I have some
kind of firewall in place, and might think I would make a more
interesting target.
Granted, if an attacker is specifically targeting my box, then it
doesn't really matter. But if he's running a general scan over a bunch
of IPs, then the IPs that DROP packets will stand out, because the scan
will come to a screeching halt while waiting for the connection attempts
to timeout.
--
Jason Day jasonday at
<a rel="nofollow" href="http://jasonday.home.att.net">http://jasonday.home.att.net</a> worldnet dot att dot net
"Of course I'm paranoid, everyone is trying to kill me."
-- Weyoun-6, Star Trek: Deep Space 9
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<ul><li><strong>Follow-Ups</strong>:
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<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="00208" href="msg00208.html">[ale] Nmap + filtered ports</a></strong>
<ul><li><em>From:</em> cfowler at outpostsentinel.com (Christopher Fowler)</li></ul></li>
</ul></li></ul>
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<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>
</ul></li></ul>
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