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>
>
> On 12/16/05, *Chris Ricker* <kaboom at oobleck.net
> <<a rel="nofollow" href="mailto:kaboom";>mailto:kaboom</a> at oobleck.net>> wrote:
>
>
> That's the whole point -- you have to return something if you want
> it to
> look "normal"
>
> If you connect to a normal, unfiltered port with nothing listening
> on it,
> a compliant TCP/IP stack does not drop your connecting packet on the
> floor. Instead, it returns a response that lets you know there's no
> service listening on that port:
>
> * for TCP, it returns a TCP reset
>
> * for UDP, it returns an ICMP port unreachable
>
> By using the "-p tcp -j REJECT --reject-with tcp-reset" or "-p udp -j
> REJECT", your filter response is the same as an unfiltered,
> unbound port's
> response
>
> That's not to say an "iptables -p tcp -j REJECT --reject-with
> tcp-reset"
> is undetectable, just that it's a lot less obvious than an
> "iptables -p
> tcp -j DROP". Whether that's good or bad is situation-dependent and
> opinion-dependent ;-)
>
>
>
> 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.
>
> Or am I not understanding this correctly?
>
>------------------------------------------------------------------------
>
>_______________________________________________
>Ale mailing list
>Ale at ale.org
><a rel="nofollow" href="http://www.ale.org/mailman/listinfo/ale";>http://www.ale.org/mailman/listinfo/ale</a>
>
Don't you remember "War Games" the movie? I hope I got the name right.
You start the modems on a dial up script and go to work/school. No
time wasted. Then come back a thumb through the logs. Or do a script
that takes you to points of interest. Same can be said for reviewing
your system logs. Which is why I won't use a software box as a gateway
anymore. I am to busy to keep up with all the hacks and updates needed
to stay ahead of the script kiddies. Although, I would love to play
with the "tarpit" thing one day. Some how knowing that I am screwing
with some ones head and hold their TCP connections hostage, brings a
smile to my face.
Wonder what would have if I did this on a cooperate network on port
139......I am thinking pink slip.
Adrin
</pre>
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<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>
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