RouterOS

DoS and DDoS attacks are some of the most common malicious online activities used by hackers to disrupt a network, misuse victim devices, gain unauthorized access and so on. Using simple firewall configurations in RouterOS, you can fend off a sudden DDoS attack to gain control over your router, stop traffic floods, and make sure your hardware does not crash as a result of such cyber threats.

As mentioned in previous tutorials, the five main processes of the routing flow in RouterOS are prerouting, input, forward, output, and postrouting, each of which are comprised of different smaller stages. In this session, we will be configuring all those smaller steps and seeing them in action via the Log utility for the three main types of input, forward, and output traffic.

Continuing our introduction to firewall in RouterOS, we're focusing on the Routing Flow on Layer 3 as the overall stage in which all routing processes and decisions happen. Also, we'll take a closer look at the five main processes inside the Routing Flow, namely prerouting, input, forward, output and postrouting, detailing the smaller steps taken to complete each of them.

Following our discussions on the physical In/Out Interfaces in RouterOS packet flow, we are going to have a look at the three main types of expected network traffic, namely input, output and forwarded traffic. With different examples on our MTCNA home lab, we see the details of traffic behavior traveling between our devices and review the log records of these types of ongoing traffic.

The next module in MikroTik Canada's online MTCNA course deals with the interesting topic of firewall, and, in the first part of our introduction, we will discuss the packet flow diagram, its different sections, MPLS and Layer 2.5, as well as the position of the IN and OUT physical interfaces with regard to the direction of traffic flow.