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Diving into Firewall and Packet Flow

Start Your Firewall Journey!

We have finally arrived at the hot topic of firewall and packet flow in our online MTCNA program, and, as the first part of our introduction, we take a look at the packet flow diagram.


Watch the video below now!

The Topics We Cover...

In this video, we first discuss the common sense, underlying rationale of the creation of firewall from a social standpoint.


Next, we introduce the two concepts of Local Area Network (LAN) and Wide Area Network (WAN) and go on to identify these networks in the MTCNA home lab network from the viewpoint of the Class Access Point.


Afterward, we discuss the subjects of MPLS and OSI Model Layer 2.5, which eventually lead us to the main RouterOS packet flow diagram.


Finally, as the first part of our introduction to packet flow in RouterOS, we talk about physical IN and OUT interfaces and a given device and discuss them in relation to the incoming and outgoing traffic.

Interested to Learn More About RouterOS Firewall?

If You've Missed the Basics...

If you haven't been up to date on our tutorials, we recommend you watch the two videos below so as not to be in the dark regarding our introduction to packet flow in RouterOS and further firewall configurations.

Interested in Advanced Courses?

In addition to our free MTCNA program that is always available on our YouTube channel, we are offering a number of more advanced MikroTik engineering courses both in-person and online.


If you're interested, head over to our training webpage and check out these courses and their dates. Alternatively, you can always give us a call to find out more!

MikroTik News

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In today's fast-paced digital world, the demand for higher bandwidth and faster transmission speeds is ever-increasing. As enterprises and data centers shift towards 100G Ethernet data transmission, MikroTik stands at the forefront with its latest offering: the CRS504-4XQ-IN Switch.

The CRS504-4XQ-IN is not just another switch in the market. It's your compact, energy-efficient gateway to the world of 100 Gigabit networking. Designed as the next logical step for those looking to upgrade from 10 or 40 Gigabit networks, this switch boasts multiple powering options and dual hot-swap power supplies.

In the rapidly evolving world of networking, the demand for faster data transfer rates is relentless. As more PCs and client devices ship daily with 2.5G ports, the market for multi-gigabit speeds is expanding at an unprecedented rate.


 Until recently, the leap from 1G to 10G was a costly endeavor for many. However, the landscape is shifting, and MikroTik's CRS310-8G+2S+IN is at the forefront of this change.