This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
One interesting question suppose you want to also create a DMZ and put a proxy server there for all employees to use for internet access.
Could you use the same DMZ that you have already configured for your WebServer and incoming traffic?