From: Nick Drage <nickd@funkyjesus.org>
To: netfilter@lists.netfilter.org
Subject: Re: making services invisible
Date: Fri, 11 Oct 2002 17:54:56 +0100 [thread overview]
Message-ID: <20021011175456.C3805@funkyjesus.org> (raw)
In-Reply-To: <003001c2706b$20982a50$3201a8c0@leonardo>; from leolistas@solucoesip.net on Thu, Oct 10, 2002 at 11:41:32AM -0300
On Thu, Oct 10, 2002 at 11:41:32AM -0300, Leonardo Rodrigues ( listas ) wrote:
>
> DROP would make nmap ( or any other scanner ) mark that port as filtered
> too. To make services closed and 'invisible' to scanners, you should use '-j
> REJECT --reject-with tcp-reset'.
Spot on :)
Isn't this one in an FAQ somewhere by now, seeing as no-one ever reads the
rather good nmap man page.
I haven't checked but last time I looked the TTL will be different with RSTs
sent from iptables rather than those sent because there's no listener on the
port. There are ways around this too, depends how invisible you want to
be...
--
FunkyJesus System Administration Team
next prev parent reply other threads:[~2002-10-11 16:54 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-10 13:13 making services invisible Julio Cesar Ody
2002-10-10 13:25 ` Ryan Daly
2002-10-10 13:46 ` Eric Leblond
2002-10-10 14:41 ` Leonardo Rodrigues ( listas )
2002-10-11 16:54 ` Nick Drage [this message]
2002-10-12 15:57 ` How will stop follwoing service Sundaram Ramasamy
2002-10-10 14:24 ` making services invisible Kevin Dwyer
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