Author: Marcin Bialy

Problem description I came across one of customer’s problem with Cisco wireless controller and 802.1x network. Radius service was driven by NPS (Microsoft Windows Radius). After setup of new NPS server customer configured the second Radius server on WLC swaping the radius server priority (on the first place under the WLAN Security -> Advanced tab […]

The problem, network components and topology I recently faced the issue with AP join to vWLC. Cisco 2700 AP could not join to newly installed Cisco vWLC controller. Coleague asked me to take a look and explained the topology. The vWLC was located in Grandmetric DC Testing Labs whereas Cisco CAP-2700 was located at Grandmetric […]

Today I have privilige to announce our new Cisco ASA & ASA FirePOWER Services training agenda. In this post I will describe the agenda in detail and what you can expect from each training module. As you perhaps racall from short agenda posted on our training list, this training is a condensed meshup prepared specialy […]

In this post we are going to focus on the following process: “destination IP field of packet is checked against information stored in router”. The place where routing information is stored is called a routing table.  Routing table contains routing entries, that is list of destinations (often called: list of network prefixes or routes).

As you might be aware, bits are a form of language for machines and packets are series (groups) of these bits that traverse the network. The mechanism via which these packets travel across the network is organized thanks to Internet Protocol (IP is set of common rules, structures and descriptions). In general, we have: END DEVICES (like […]

No 1 principle of SDN is to separate the devices abstraction that transport the network traffic (forwarding plane) from control plane abstraction, in such a way that it enables to control the network functions by the means of software layer. In practice it can be systems, web applications, and scripts.

Often, during meetings with clients, network engineers and security specialist there is following question posed: “What firewall product best suits their environment and which one is the best currently on the market?” Like almost always the answer could be “Well, it depends” …

Routing is the crucial process in IP networks responsible for IP prefix propagation and keeping the whole network topology in order. Having billions of IP addresses divided into many different subnets, without routing there would be muddle that will prevent the whole Internet from working. So, routing is like the set of rules that allows localize particular IP network and IP addresses that belongs to that network.

  Technology combined training. We are announcing the Cisco ISE & Internet Edge 4 Days accelerated workshop. This is one-time training & the only one in the market. This is combined training for those who want to improve Cisco ISE troubleshooting and configuration skills as well as get familiar with BGP routing for Enterprise WAN […]

With this “What is DHCP and how does it work?” post we are starting a new cycle of “Explained” blog posts dedicated to explaining networking fundamentals. If you want to read about a certain topic, please leave a message or comment posts!