In this third post in our EIGRP series, let’s consider the various packet types used and their purpose. Altogether, we encounter five packet types in EIGRP that are used to establish adjacencies and share routing information. The packet types include: Hello, Acknowledgment, Update, Query and Reply. Some of the EIGRP Read More
In our last post, we took a look at a basic EIGRP configuration. Now we’ll take a step back and consider some of the essential features of EIGRP. EIGRP is a Cisco-proprietary dynamic routing protocol that debuted in 1992. Although Cisco attempted to make it an open standard protocol a Read More
In this lab, we’ll do a basic configuration of EIGRP and then run a bunch of verify commands. We’ll finish off with a ping test to verify end-to-end connectivity between the PCs. This time the lab is being done on Packet Tracer instead of GNS3. Packet Tracer is easier to Read More
In an age of rampant security attacks, safeguarding data is paramount. After all, data is the new Kohinoor for organizations of all sizes in the modern era. secure-delete is one of the command line tools available for Ubuntu and its derivatives like Linux Mint to securely erase data. Secure file and Read More
In this lab, we’ll configure authentication when running EIGRP in named mode. While classic mode EIGRP offers only MD5 authentication, named mode EIGRP offers both MD5 and HMAC-SHA-256 authentication. HMAC-SHA-256 authentication is, of course, the more secure version. By the way, we can configure authentication between two routers with one Read More
Dynamic Multipoint Virtual Private Network (DMVPN) owes its popularity to two primary reasons: scalability and simplicity of configuration. In large organizations with lots of branches, configuring dozens of point-to-point VPN tunnels is an error-prone and cumbersome exercise. So Cisco introduced the DMVPN technology nearly two decades ago. DMVPN finds favor Read More