What is so special about the new Software-Defined WAN concept besides the many marketing slogans like “Redefining Networks for Cloud era” or “Transport independent secure fabric” or where the “66% cost reduction” comes from? First of all, when we talk about SDWAN we can think of it as the practical enforcement of the Software-Defined Network (SDN) Read More
Month: December 2020
How to Send Mails From Command Line in Linux (Postfix)
In this tutorial, we shall be using an enhanced version of the mail command. It’s called mailx (or just mail when installed), and it can do many more things than what the older mail command from gnu mailutils package can do. How does it work The mail/mailx command needs a local smtp server (MTA) running Read More
Linux / UNIX: Bash Script Sleep or Delay a Specified Amount of Time
Author: Vivek Gite How do I pause for 5 seconds or 2 minutes in my bash shell script on a Linux or Unix-like systems? You need to use the sleep command to add delay for a specified amount of time. The syntax is as follows for gnu/bash sleep command:sleep NUMBER[SUFFIX] Where SUFFIX may be: s for seconds Read More
How to Use COUNTIF in Excel
Use the COUNTIF function to make Excel count words or numbers in any range of cells. Instead of manually counting how often a certain value or number appears, let Excel do the work for you. With the COUNTIF function, Excel can count the number of times a word or number appears in any range of Read More
Understanding PIM Sparse Mode vs Dense Mode
Sparse-dense mode, as the name implies, allows the interface to operate on a per-group basis in either sparse or dense mode. A group specified as dense is not mapped to an RP. Instead, data packets destined for that group are forwarded by means of PIM dense-mode rules. A group specified as sparse is mapped to Read More
What Is Intent-based Networking (IBN)?
Intent-based networking (IBN) is an emerging technology concept that aims to apply a deeper level of intelligence and intended state insights to networking. Ideally, these insights replace the manual processes of configuring networks and reacting to network issues. Simply put, administrators can send a request to tell the network what outcome they want (their intent) instead Read More