As we wrap up this book, hopefully you've taken many of my suggestions for further reading. This chapter focused, once again, on an advanced and extremely niche topic, for which there isn't much in the way of additional resources. However, if you are still interested in the subject of secure network tunneling, I would recommend the book Understanding SSL VPN, by Joseph Steinberg and Tim Speed. It gives a comprehensive look at the ins and outs of how secured VPNs work, and how they are administered. It's certainly something that will be of interest as you carry your new knowledge forward and plumb the depths of network programming. The book is available through Packt Publishing Ltd., and you can find a copy here: https://www.packtpub.com/networking-and-servers/ssl-vpn-understanding-evaluating-and-planning-secure-web-based-remote-access.
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