一般判断网络连通性用ping 和tracert.
ping的话可以来判断丢包率，tracert可以用来跟踪路由.

在Linux中有一个更好的网络连通性判断工具，它可以结合ping nslookup tracert 来判断网络的相关特性,这个命令就是mtr

官网: http://www.bitwizard.nl/mtr/
Github: https://github.com/traviscross/mtr

官方说明

mtr combines the functionality of the 'traceroute' and 'ping' programs in a single network diagnostic tool.

As mtr starts, it investigates the network connection between the host mtr runs on and a user-specified destination host.  
After it determines the address of each network hop between the machines, 
it sends a sequence of ICMP ECHO requests to each one to determine the quality of the link to each machine.  
As it does this, it prints running statistics about each machine.

使用

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mtr baidu.com

可以查看到不同的网络节点，有时候网络不通，能够找到阻塞点。

安装

Linux 安装

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yum -y install mtr

MacOS安装

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brew install mtr

提示已经安装成功
运行mtr出现提示

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-bash: mtr: command not found

解决方法：

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alias mtr=/usr/local/sbin/mtr

然后运行还是会出现问题mtr: unable to get raw sockets.
需要添加权限

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sudo chown root mtr
sudo chmod u+s mtr

源码编译安装

https://github.com/traviscross/mtr

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git clone https://github.com/traviscross/mtr.git

cd mtr

./bootstrap.sh && ./configure && make

# 测试是否成功
sudo ./mtr <host>

make install

Windows安装

Windows安装需要Cygwin