If we look back at this chapter, we learned quite a bit about troubleshooting network connectivity issues on Linux. We learned how to use the
tcpdump tools to look at the incoming and outgoing connections. We learned about the TCP three-way handshake and how the
/etc/hosts file can supersede the DNS settings.
In this chapter, we covered many commands, and while we gave a pretty good overview of each command and what it does, there are some that we barely scratched the surface on.
Commands such as
tcpdump are a prime example of this. In this chapter, we used
tcpdump quite a bit, but this tool is capable of far more than we used it for. Of all of the commands that we covered in this book, I personally feel that
tcpdump is one to ...