ping这个小工具大家都非常熟悉，但是他不能ping端口，当我们需要知道目的地址的某端口是否开放时，这时需要用到这个tcping小工具了，Windows没有自带这个小工具，需要自己下载下来，放到指定目录里面。
放到C:\Windows\System32这个文件夹下
我们就针对tcping -t 59.46.9.195 3389进行说明,这个意思就是连续ping服务器59.36.100.195的3389端口,去掉-t就只发送默认的4次tcp包。
现在在测试一下：
语法
C:\Users\Administrator>tcping -help
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tcping.exe by Eli Fulkerson
Please see http://www.elifulkerson.com/projects/ for updates.
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Usage: tcping [-flags] server-address [server-port]
Usage (full): tcping [-t] [-d] [-i interval] [-n times] [-w ms] [-b n] [-r times] [-s] [-v] [-j] [-js size] [-4] [-6] [-c] [-g count] [-S source_address] [--file] [--tee filename] [-h] [-u] [--post] [--head] [--proxy-port port] [--proxy-server server] [--proxy-credentials username:password] [-f] server-address [server-port]
-t : ping continuously until stopped via control-c
-n 5 : for instance, send 5 pings
-i 5 : for instance, ping every 5 seconds
-w 0.5 : for instance, wait 0.5 seconds for a response
-d : include date and time on each line
-b 1 : enable beeps (1 for on-down, 2 for on-up,
3 for on-change, 4 for always)
-r 5 : for instance, relookup the hostname every 5 pings
-s : automatically exit on a successful ping
-v : print version and exit
-j : include jitter, using default rolling average
-js 5 : include jitter, with a rolling average size of (for instance) 5.
--tee : mirror output to a filename specified after '--tee'
--append : Append to the --tee filename rather than overwriting it
-4 : prefer ipv4
-6 : prefer ipv6
-c : only show an output line on changed state
--file : treat the "server-address" as a filename instead, loop through file line by line
Note: --file is incompatible with options such as -j and -c as it is looping through different targets
Optionally accepts server-port. For example, "example.org 443" is valid.
Alternately, use -p to force a port at command line for everything in the file.
-g 5 : for instance, give up if we fail 5 times in a row
-S _X_ : Specify source address _X_. Source must be a valid IP for the client computer.
-p _X_ : Alternate method to specify port
--fqdn : Print domain name on each line if available
--ansi : Use ANSI color sequences (cygwin)
--color: Use Windows color sequences
HTTP Options:
-h : HTTP mode (use url without http:// for server-address)
-u : include target URL on each line
--post : use POST rather than GET (may avoid caching)
--head : use HEAD rather than GET
--proxy-server : specify a proxy server
--proxy-port : specify a proxy port
--proxy-credentials : specify 'Proxy-Authorization: Basic' header in format username:password
Debug Options:
-f : force tcping to send at least one byte
--header : include a header with original args and date. Implied if using --tee.
--block : use a 'blocking' socket to connect. This prevents -w from working and uses the
default timeout (as long as 20 seconds in my case). However it can detect an actively
refused connection vs a timeout.
If you don't pass server-port, it defaults to 80.
翻译
-t 不停的发送数据包直到 按ctrl+c 停止，可以用此命令做小破坏。
-n 5 一次发送 5 个数据包，默认一次发送4个 ： tecping -n 5 www.baidu.com 会tcping 百度5次，也可以跟其他数字。
-i 5 5秒发送一个数据包 ： tcping -i 5 www.baidu.com 每间隔5秒tcping一次百度，也可以跟其他数字，也可以跟小数 ：tcping -i 0.5 www.baidu.com 每隔 0.5秒tcping 一次百度。
-w 0.5 tcping不通的等待时间 tcping通则忽略次参数 ： tcping -w 0.5 www.baidu.com 如果ping不同会等待0.5秒，默认tcping不通等2s，tcping 通则忽略此参数。
-d 在每行前面显示详细日期时间。
-b 1-4 ping的时候会响铃，参数4会一直响铃 ： tcping -b 4 www.baidu.com
每显示一行内容就会响铃一次，默认会响铃4次
-r 5 每发送5个数据包重新查找主机一次（通过DNS或路由查找）
-s ping通就立即退出
-v 显示版本信息
-j 使用默认的方法求ping的均值减小波动，网络有一定的不稳定性用此参数可以减小波动。
-js 5 用5个实例求平均值减小波动，使用这个参数系统会tcping 5次然后求出平均值作为一次结果显示，减小波动。
–tee 将结果输出到指定位置 ：tcping –tee d:\test.txt192.168.0.100 会将ping的结果保存在d盘下的test文件