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The networks category covers networking protocols, data transmission methods, network addressing, and network security. Understanding network fundamentals is crucial for designing, implementing, and managing reliable and secure communication systems.

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OBSERVABILITY
NETWORKS

In-band network telemetry — what is it all about?

In-band network telemetry is one concept from a wide range of available solutions for network telemetry. If you want to know what this approach is all about and how it has been adopted so far, please read on. Over the years, a wide variety of protocols, methods, and tools have been developed for network telemetry. These solutions are quite diverse and are used depending on the specific context and needs. Some time ago, one more concept appeared on the map: in-band network telemetry. The approach here is to gather so-called telemetry metadata for packets traversing network segments.
Multiple authors

Multiple authors

on Jan 30, 2023
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NETWORKS

Linux as a network device

Using Linux as a network device can result in many benefits. Find out what network devices are and why it’s a good idea to use Linux as one. This is actually not an easy question to answer. In general, one can say that a network device is a piece of equipment whose main role is to forward packets or perform actions on them. While packet forwarding seems easy to understand, the actions that a packet can be a subject to differ between device types. For example, a router will (usually) route an IP packet based on a (OSI model) layer 3 header, a switch will use layer 2 for that, and a firewall can dig deeper into the packet payload.
Multiple authors

Multiple authors

on Jan 23, 2023
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NETWORKS

What is Policy Based Routing (PBR)?

Nowadays, network traffic nature becomes very complicated in terms of the mixture of applications and their connectivity requirements. Achieving these requirements by means of traditional routing mechanisms may become cumbersome or even impossible and requires special dedicated solutions. Additionally, organizations need to focus on operational costs more strictly than in the past. One good direction to achieve this goal is the optimization of resource usage within different domains. Networking is one such domain, where the objective is to rationally maximize the usage of existing infrastructure rather than making an investment in increasing its capacity.
Łukasz Drzewiecki

Łukasz Drzewiecki

on Jan 16, 2023
Thumbnail of an article about VLAN vs. VXLAN — what’s the difference and is one better than the other?
NETWORKS

VLAN vs. VXLAN — what’s the difference and is one better than the other?

VM, VDI, VIM, NFVI, VLAN, VXLAN, VNF - the famous ‘V’ that dominates today’s IT world stands, of course, for ‘Virtual’. Every day we use virtualized servers, storage, desktop or networks without even realizing it. The convenience, cost-saving, enhanced features and security are just some of the reasons why we start using virtualization and often never look back. The same is true for computer networking, where a single physical network can host multiple separated, logical (virtual) networks that may have different topologies and feature sets or even carry traffic of different customers without interfering with each other.
Jerzy Kaczmarski

Jerzy Kaczmarski

on Jan 13, 2023
Thumbnail of an article about HTTP/3 Protocol — Performance and Security Implications
NETWORKS

HTTP/3 Protocol — Performance and Security Implications

Web browsers use various protocols to deliver to users what they need. The best-known internet protocol is called HTTP. And just like any other technology, it is not immune to change. Read the article to learn about the HTTP protocol's history and compare its newest versions. The Hypertext Transfer Protocol (HTTP) is the foundation of the World Wide Web and is used to load web pages using hypertext links. HTTP is an application-layer protocol designed to transfer information between devices and runs on top of other layers of the network protocol stack.
Dominik Sieciński

Dominik Sieciński

on Jan 9, 2023
Thumbnail of an article about AI and Machine Learning landscape for networks [infographic]
NETWORKS
DATA

AI and Machine Learning landscape for networks [infographic]

Aritifical intelligence (AI) and machine learning (ML) is a trending topic in all technological domains. It offers a rich set of methods for data processing that can be used to solve practical problems, including those occurring in networks. In this article we present a set of network issues for which the use of ML methods and different AI types can bring benefits and generally seems to make sense. Please note that this is a non-exhaustive list and is open to additions. For greater clarity, five main categories have been used.
Multiple authors

Multiple authors

on Jan 5, 2023
Thumbnail of an article about SONiC adaptation for custom functionality — the PoC reveal
NETWORKS

SONiC adaptation for custom functionality — the PoC reveal

In the previous part, we introduced both the higher and the lower level concepts necessary for understanding the use case scenario as well as a proposed solution, starting from its prerequisites through to the design and finally the implementation. In this concluding article of the series, we want to eventually answer the initially-posed question: can we adapt a SONiC switch to be able to deliver a custom functionality? In our case, a load balancing feature for GTP-U. In order to conduct this PoC we needed to:
Multiple authors

Multiple authors

on Dec 28, 2022
Thumbnail of an article about Management vs. Control vs. Data Planes in a Network Device
NETWORKS

Management vs. Control vs. Data Planes in a Network Device

An application, a system or even a simple device is made up of several components, each of which performs specific functions to the best of its ability, while leaving other tasks to other components which are dedicated to taking care of them. For example, a web application may consist of a HTTP server which provides the UI, a database server which keeps information about users, and a content server where images and videos are stored. Such an approach to dividing responsibilities is no different in networking devices, where hardware and software components work together to analyze and forward traffic according to the configuration applied by the administrator.
Jerzy Kaczmarski

Jerzy Kaczmarski

on Dec 22, 2022
Thumbnail of an article about Packet dropping method: Iptables vs. alternatives in Linux
NETWORKS

Packet dropping method: Iptables vs. alternatives in Linux

Have you ever wondered about alternatives to iptables for dropping packets in Linux OS? Well, there are a few methods to do this. In this blog post we want to share them with you.
Adam Kułagowski

Adam Kułagowski

on Dec 20, 2022
Thumbnail of an article about Enhancing SONiC — the process of developing custom network functionality
NETWORKS

Enhancing SONiC — the process of developing custom network functionality

In the previous article, we introduced our reasons for exploring SONiC’s potential in terms of building new network functionalities, presented a use case, and described how we approached the task on the logical level. In this part, we want to share the experience we have gained through the development process. Note: please do not treat this as a comprehensive developer’s guide. What we explain here is our process and the key takeaways from it, which we believe might come in handy for other SONiC developers.
Multiple authors

Multiple authors

on Dec 16, 2022
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