From owner-freebsd-stable@FreeBSD.ORG  Tue Apr 19 11:33:48 2005
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Date: Tue, 19 Apr 2005 13:33:46 +0200
From: peceka <peceka@gmail.com>
To: Dominic Marks <dom@helenmarks.co.uk>
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	 <200504191216.24362.dom@helenmarks.co.uk>
cc: freebsd-stable@freebsd.org
Subject: Re: FreeBSD and NMAP
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On 4/19/05, Dominic Marks <dom@helenmarks.co.uk> wrote:
> On Tuesday 19 April 2005 12:11, pck wrote:
> > Hi,
> >
> > How can i hide from nmap that my OS is FreeBSD? Is this possible?
>=20
> # sysctl -ad | grep random_id
> net.inet.ip.random_id: Assign random ip_id values
> # echo 'net.inet.ip.random_id=3D1' >> /etc/sysctl.conf

After that:
Interesting ports on 192.168.1.248:
(The 1643 ports scanned but not shown below are in state: closed)
Port       State       Service
22/tcp     open        ssh
Device type: general purpose
Running (JUST GUESSING) : FreeBSD 5.X|4.X (95%), Apple Mac OS X 10.1.X
(88%), OpenBSD 3.X|2.X (88%), Apple Mac OS 8.X (85%)
Aggressive OS guesses: FreeBSD 5.0-RELEASE (95%), Apple Mac OS X
10.1.5 (88%), FreeBSD 4.3 - 4.4PRERELEASE (88%), FreeBSD 5.0-RELEASE
(x86) (88%), FreeBSD 5.1-CURRENT (June 2003) on Sparc64 (88%), OpenBSD
3.0 or 3.3 (88%), Apple Mac OS X 10.1.4 (Darwin Kernel 5.4) on iMac
(86%), FreeBSD 4.5-RELEASE (or -STABLE) through 4.6-RC (X86) (86%),
FreeBSD 4.7-RELEASE (86%), FreeBSD 5.0-RELEASE or -CURRENT (Jan 2003)
(86%)
No exact OS matches for host (test conditions non-ideal).
Uptime 0.003 days (since Tue Apr 19 13:22:41 2005)

So it didn't help much...


Best Regards,
p.