Wireshark Revealed: Essential Skills for IT Professionals

Discovering DoS and DDoS attacks

Denial of Service (DoS) and Distributed Denial of Service (DDoS) are attacks that intend to deny users from accessing network services. Services that can be denied to users can be:

• Communication lines: This will usually be done by generating traffic that floods and blocks the communications line
• Applications and services (web services, mail services, and so on): This will usually be done by loading a server to a point at which it will not be able to serve clients' requests

DoS/DDoS attacks can be a result of scanning that we talked about in the previous recipe. The difference is that DoS/DDoS is a scan that slows down a server or a network in a way that denies user access.

In this recipe, we will see some common DoS/DDoS ...