Re: NMAP Switches, -sS, -sT, etc.

From: Marco Ivaldi (raptor@0xdeadbeef.info)
Date: Thu Mar 30 2006 - 06:19:58 EST


On Tue, 28 Mar 2006, Tim Brown wrote:

> I quite like nmap -sO -P0 to identify live hosts:

This won't detect a properly firewalled [1] host:

root@pandora:~# nmap -sO -P0 x.x.x.x

Starting Nmap 4.01 ( http://www.insecure.org/nmap/ ) at 2006-03-30 13:12
CEST
All 256 scanned ports on xxx.mediaservice.net (x.x.x.x) are:
open|filtered

Nmap finished: 1 IP address (1 host up) scanned in 6.937 seconds
root@pandora:~# telnet x.x.x.x 22
Trying x.x.x.x...
Connected to x.x.x.x.
Escape character is '^]'.
SSH-2.0-OpenSSH_4.3

Protocol mismatch.
Connection closed by foreign host.

[1] See example fw policy at http://www.0xdeadbeef.info/conf/rc.iptables.1

-- 
Marco Ivaldi
Antifork Research, Inc.   http://0xdeadbeef.info/
3B05 C9C5 A2DE C3D7 4233  0394 EF85 2008 DBFD B707
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