我经常用它来检测远程的 Windows服务器的ip地址，因为不是固定ip地址，该服务器的ip地址会经常变化，但是有个规律，只在一个网段内变化，这样就给ip地址的确定带来 了方便。
1. 如果没有安装nmap，就安装
yum install -y nmap
2. 扫描指定网段的远程桌面连接端口
nmap -sT -p3389 218.206.112.0/24
3. 如果觉得输出太多，可以用 grep 命令过滤
nmap -sT -p3389 218.206.112.0/24 | grep -B2 open
下面是操作的消息记录，备查。
.
[[email protected] opt]# nmap
-bash: nmap: command not found
[[email protected] opt]# yum install -y nmap
...
[[email protected] opt]# nmap -sT -p3389 218.206.112.0/24
Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2012-10-26 15:36 CST
Interesting ports on 218.206.112.1:
PORT STATE SERVICE
3389/tcp closed ms-term-serv
Interesting ports on 218.206.112.11:
PORT STATE SERVICE
3389/tcp filtered ms-term-serv
...
[[email protected] opt]# nmap -sT -p3389 218.206.112.0/24 | grep -B2 open
Interesting ports on 218.206.112.100:
PORT STATE SERVICE
3389/tcp open ms-term-serv
--
Interesting ports on 218.206.112.132:
PORT STATE SERVICE
3389/tcp open ms-term-serv
[[email protected] opt]#
