MTR is a useful tool to diagnose network issues between two points. Its also very easy to install on MacOS using Homebrew:

$ brew install mtr

However once you try and run the mtr command, the following error is returned:

mtr: command not found or mtr: Failure to start mtr-packet: Invalid argument)

This occurs because Homebrew installs mtr in the /usr/local/sbin directory instead of the more commonly used /usr/local/bin directory. To stop the errors from occurring, you just need to add /usr/local/sbin to your shell $PATH variable. Simply add the following line to ~/bash_profile :

export PATH="$PATH:/usr/local/sbin"