How to Practice Linux Skills for Free
Colleagues and friends often ask me how they can learn or practice Linux when they only have Windows at work and a single family Windows computer at home, for free. That’s a good question, and there are a couple of different answers. Before we get to the free methods, I want to acknowledge that there […]
Is Perfect the Enemy of Good Enough in Software-Defined Networking?
Perfect is the enemy of good. That’s an old saying. Confucius (551-479 BC) said, “Better a diamond with a flaw than a pebble without.” Aristotle (384-322 BC) said something similar. Voltaire popularized the phrase in the 1770s. And maybe that’s where we are with SDN WAN. Software-Defined Networking and Wide Area Network Links Software-defined networking, […]
Unleashing Wireshark’s Powerful Follow TCP Stream Feature
In security courses such as Learning Tree’s System and Network Security Introduction, we often hear about the insecurity of protocols such as Telnet. These older protocols send their data – including login credentials – over the network in the clear. While ssh, a secure alternative to Telnet, is used in many applications today, many sites […]
How Will Vehicle-To-Everything (V2X) Communication Transform Your Car?
A casual mention of Vehicle to Everything, or V2X, in a mailing list, led me to a short article, and that led to much more. It made me aware of a project that may make huge changes to how we get around. Roads can measure cars in very limited ways today with inductive loops at […]
What Does the IANA Transition Mean for Us?
When I first worked with TCP/IP and the ARPAnet, there was no DNS. When one wanted to connect to a computer by name, the system looked in a table called “HOSTS.TXT” to find the IP address corresponding to the name. The growing file had to be downloaded every few days from a “nearby” host that […]