In this chapter, we covered how to protect against DoS attacks using the Shield, protect against intrusions using Untangle's Intrusion Prevention application, and prohibit access to specific ports using Untangle's Firewall application. The concepts behind each technology were covered. We also saw how to configure, manage, and monitor the applications' activities.

In the next chapter, we will continue covering Untangle applications. This time, we will cover how to block users' access to certain sites based on their category such as pornography and social media.

Most of today's websites are HTTPS, so the regular filtering methods may fail to work properly; thus, there is a need to have an application that can decrypt HTTPS traffic and pass it to the other modules for scanning as a normal HTTP stream. In the next chapter, we will cover the Untangle application for this purpose (HTTPS Inspector). Eventually, we will learn how we can block certain applications (Facebook, Skype, and so on...