[FUGSPBR] OFF-TOPIC - NMAP eoutros

[FreeBSD]

Galera,

Instalei um  firewall e depois passei o NMAP de uma rede externa o mesmo me
retornou o log abaixo, alguem podem me explicar o que esta acontecendo.
============================================================================
================
Starting nmap V. 3.00 ( www.insecure.org/nmap )
Interesting ports on xxxx.xxxxx.com.br (XXX.XXX.XXX.XXX):
(The 1593 ports scanned but not shown below are in state: filtered)
Port       State       Service
20/tcp     closed      ftp-data
21/tcp     closed      ftp
22/tcp     closed      ssh
25/tcp     closed      smtp
110/tcp    closed      pop-3
443/tcp    open        https
2301/tcp   closed      compaqdiag
5999/tcp   closed      ncd-conf
No exact OS matches for host (If you know what OS is running on it, see
http://www.insecure.org/cgi-bin/nmap-submit.cgi).
TCP/IP fingerprint:
SInfo(V=3.00%P=i686-pc-windows-windows%D=7/11%Time=3F0E340C%O=443%C=20)
TSeq(Class=TR%IPID=I%TS=100HZ)
T1(Resp=Y%DF=Y%W=E000%ACK=S++%Flags=AS%Ops=MNWNNT)
T2(Resp=N)
T3(Resp=Y%DF=Y%W=E000%ACK=S++%Flags=AS%Ops=MNWNNT)
T4(Resp=Y%DF=N%W=0%ACK=O%Flags=R%Ops=)
T5(Resp=Y%DF=N%W=0%ACK=S++%Flags=AR%Ops=)
T6(Resp=Y%DF
=N%W=0%ACK=O%Flags=R%Ops=)
T7(Resp=Y%DF=N%W=0%ACK=S%Flags=AR%Ops=)
PU(Resp=N)
Uptime 2.387 days (since Tue Jul 08 15:32:36 2003)
Nmap run completed -- 1 IP address (1 host up) scanned in 367 seconds
============================================================================
================

O que vcs recomenda a mais para  melhorar a segurança da minha rede? ex:
snort , porsentry, etc

Att,

Alan Lopes

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