4、使用端口扫描工具
[root@localhost ~]# nmap ... -p Starting Nmap . ( http://nmap.org ) at -- : CST Nmap scan report for ... Host is up (.s latency). PORT STATE SERVICE /tcp closed http MAC Address: B:A::CF:FD:D (Unknown) Nmap done: IP address ( host up) scanned in . seconds [root@localhost ~]# nmap ... -p Starting Nmap . ( http://nmap.org ) at -- : CST Nmap scan report for ... Host is up (.s latency). PORT STATE SERVICE /tcp open http-proxy MAC Address: B:A::CF:FD:D (Unknown) Nmap done: IP address ( host up) scanned in . seconds [root@localhost ~]# nmap ... Starting Nmap . ( http://nmap.org ) at -- : CST Nmap scan report for ... Host is up (.s latency). Not shown: closed ports PORT STATE SERVICE /tcp open ssh /tcp open rpcbind /tcp open http-proxy /tcp open unknown MAC Address: B:A::CF:FD:D (Unknown) Nmap done: IP address ( host up) scanned in . seconds
总结
提供端口服务，则使用了tcp协议，上面是以web服务器为例。如果服务器是更简单的tcp服务器，三个工具同样适用.
三个工具的共同点是：1.以tcp协议为基础；2.能访问指定端口. 遵循这两点可以找到很多工具.
一般在windows下使用telnet比较方便，linux下个人就比较喜欢用wget.
