Re: Nmap output

[τ∂υƒιφ * <tas0584 () gmail com>]

Hi Maash

If you were running fragment scan from windows box you will not get 
reliable results. This is the output of fragment scan you will always get

/C:\>nmap -P0 -f 192.168.0.xxx
Warning: Packet fragmentation selected on a host other than Linux, 
OpenBSD, FreeBSD, or NetBSD.  This may or may no
t work.
/
It is not always necessary to fragment packets to get the open ports in 
nmap. Fragmenting is just one technique for evading IPS/IDS/Firewall.
Also

For more refer

http://www.networkuptime.com


Taufiq.

-------- Original Message --------
Subject: Nmap output
From: maash.rajani () gmail com
To: pen-test () securityfocus com
Date: 11/20/2008 3:20 AM
> I scanned a host with nmap using two set of parameters.
>
> 1) nmap -P0 -f -O 192.168.100.44
>
> Warning:  OS detection for 192.168.100.44 will be MUCH less reliable because we
> did not find at least 1 open and 1 closed TCP port
> All 1690 scanned ports on host233-226.xxxx.xxx.xx (192.168.100.44) are filt
> ered
> Device type: specialized|switch|WAP|printer|general purpose
> Running: Cisco IOS 12.X, D-Link embedded, Ember embedded, IBM embedded, Lexmark
> embedded, Minix
> OS details: Cisco DOCSIS cable modem termination server running IOS 12.1, Cisco
> Catalyst 6509 running IOS 12.1, D-Link DI-824VUP Wireless VPN Router, Ember InSi
> ght Adapter for programming EM2XX-family embedded devices, IBM 6400 Printer (sof
> tware version 7.0.9.6), Lexmark T632 Network Laser Printer, Minix 3.1.2a
>
>
>
>
>
> While in the second set of parameter i did not fragment the packets.
>
> 2) nmap -P0 -O 192.168.100.44
>
> Warning:  OS detection for 192.168.100.44 will be MUCH less reliable because we
> did not find at least 1 open and 1 closed TCP port
> Warning:  OS detection will be MUCH less reliable because we did not find at lea
> st 1 open and 1 closed TCP port
> Interesting ports on host233-226.xxx.xxx.xx (192.168.100.44):
> Not shown: 1689 filtered ports
> PORT    STATE SERVICE
> 443/tcp open  https
> Device type: general purpose
> Running: IBM AIX 4.X, Microsoft Windows 2003/.NET|NT/2K/XP
> OS details: IBM AIX 4.3.2.0-4.3.3.0 on an IBM RS/*, Microsoft Windows 2003 Serve
> r or XP SP2
> Uptime: 3.360 days (since Sun Nov 16 13:22:23 2008)
>
>
>
>
> My question is without fragmenting the packets how was nmap able to determine an open port.
> And what different did fragmentation make in OS detection.
>
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