五个顶级Linux安全工具

$ nmap -sP 10.0.0.1-254
Starting nmap 3.81 ( http://www.insecure.org/nmap/ )
       at 2006-11-01 14:46
NZDT
Host 10.0.0.25 appears to be up.
MAC Address: 00:0C:F1:AE:E6:08 (Intel)
Host 10.0.0.51 appears to be up.
MAC Address: 08:00:09:9A:1A:AA (Hewlett Packard)
Host 10.0.0.70 appears to be up.
MAC Address: 00:0F:EA:64:4E:1E (Giga-Byte Tech Co.)
...

#nmap -sS 10.0.0.89
Starting nmap 3.81 ( http://www.insecure.org/nmap/ )
          at 2006-11-01 14:52
NZDT
Interesting ports on 10.0.0.89:
(The 1637 ports scanned but not shown
below are in state: closed)
PORT      STATE SERVICE
21/tcp    open  ftp
22/tcp    open  ssh
42/tcp    open  nameserver
80/tcp    open  http
110/tcp   open  pop3
...

# nmap -sV 10.0.0.89
Starting nmap 3.81 ( http://www.insecure.org/nmap/ )
        at 2006-11-01 14:47
NZDT
Interesting ports on 10.0.0.89:
(The 1637 ports scanned but not shown
below are in state: closed)
PORT      STATE SERVICE           VERSION
21/tcp    open  ftp?
22/tcp    open  ssh               OpenSSH 3.8.1p1
Debian-8.sarge.4 (protocol 2.0)
42/tcp    open  nameserver?
80/tcp    open  http              Apache httpd 1.3.33
((Debian GNU/Linux) mod_gzip/1.3.26.1a PHP/4.3.10-16)
110/tcp   open  pop3?
...

# nmap -O -sS 10.0.0.89
Starting nmap 3.81 ( http://www.insecure.org/nmap/ )
         at 2006-11-02 09:02
NZDT
Interesting ports on 10.0.0.89:
(The 1637 ports scanned but not shown
below are in state: closed)
PORT      STATE SERVICE
21/tcp    open  ftp
...
Device type: general purpose
Running: Linux 2.4.X|2.5.X|2.6.X
OS details: Linux 2.5.25 - 2.6.3 or
Gentoo 1.2 Linux 2.4.19 rc1-rc7), Linux 2.6.3 - 2.6.8
Uptime 30.906 days (since Mon Oct  2 11:18:59 2006)