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以下是使用 nmap 探测目标主机的操作系统的两个实例(两种方法都没有探测到)。nmap 工具可以上 http://insecure.org/nmap 网站下载。

一、

D:\Program Files\nmap-5.21>nmap -A 192.168.1.20 | more

Starting Nmap 5.21 ( http://nmap.org ) at 2010-01-30 22:31 中国标准时间 Nmap scan report for 192.168.1.20 Host is up (0.00s latency). All 1000 scanned ports on 192.168.1.20 are filtered MAC Address: 00:1D:72:2E:F7:64 (Wistron) Too many fingerprints match this host to give specific OS details Network Distance: 1 hop

HOP RTT ADDRESS 1 0.00 ms 192.168.1.20

OS and Service detection performed. Please report any incorrect results at http: //nmap.org/submit/ . Nmap done: 1 IP address (1 host up) scanned in 30.05 seconds

二、

D:\Program Files\nmap-5.21>nmap -O 192.168.1.20 | more

Starting Nmap 5.21 ( http://nmap.org ) at 2010-01-30 22:34 中国标准时间 Nmap scan report for 192.168.1.20 Host is up (0.00s latency). All 1000 scanned ports on 192.168.1.20 are filtered MAC Address: 00:1D:72:2E:F7:64 (Wistron) Too many fingerprints match this host to give specific OS details Network Distance: 1 hop

OS detection performed. Please report any incorrect results at http://nmap.org/s ubmit/ . Nmap done: 1 IP address (1 host up) scanned in 27.27 seconds