FreeBSD OS Detection and Uptime

Which methods used to prevent OS detection and uptime (nmap)
?
ht
tp://nmap.org/misc/defeat-nmap-osdetect.html#BSD
I tried, but not work.

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On Sat, Mar 22, 2008 at 11:14:28PM -0300,
=?ISO-8859-1?Q?Daniel_Dias_Gon=E7alves_ wrote:
> Which methods used to prevent OS detection and uptime
(nmap) ?
> ht
tp://nmap.org/misc/defeat-nmap-osdetect.html#BSD
> I tried, but not work.

The TCP Drop SYN+FIN sysctl might help.

% sysctl -d net.inet.tcp.drop_synfin
net.inet.tcp.drop_synfin: Drop TCP packets with SYN+FIN set

Regards.
-- 
Rui Paulo
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