Author Archives: Gajanan Parwar

Understanding IPV4 Header

By | July 10, 2020

In my journey of understanding the TCP/IP world. I found the understanding and learning about the IPV4 Header is most critical and useful for everyone. In this article we will not only discuss the function of each field, we will also see how these field changes when we send different kind of traffic. Overview of… Read More »

Undestanding Wait timer in OSPF

By | July 10, 2020

When we are reading OSPF at the beginning level, the most of the books only highlight about the two important timers of OSPF i.e. Hello and Dead interval but there is another timer which OSPF speaking router uses during DR and BDR election i.e. wait timer. Topology: If we look at our above topology, we… Read More »

Understanding Extreme command line interface

By | July 10, 2020

                                                 Fig 1. Standalone Switch: Summit X430               Fig 2. Extreme Stack : Summit X440 Series                Fig 3. Modular Switch : BD 8800 In this article we will learn basics of the Extreme command line interface.I thought the best way to demonstrate it by working with network topology and try to configure it from the scretch.To make the… Read More »

Understanding IP Sec VPN Operation:

By | July 10, 2020

Overview IPSEC [IP Security] is used to secure IP [IPV4 and IPV6] traffic over an untrusted network [such as the Internet] by enabling a system to select required security protocols [AH or ESP], algorithms and cryptographic keys. IP Sec Protocol used in a site-to-site VPN which interconnects two sites without requiring the computers at those… Read More »

MTU-related war story

By | April 18, 2020

MTU-related war story Found it’s interesting. Source: https://news.ycombinator.com/item?id=4709438 Well, while we’re at it, here’s my crazy MTU-related war story, although not as crazy as that one! I was troubleshooting with a user of an audio streaming application running over a LAN. The user could stream classical music but not rock music. Seriously. Classical was fine,… Read More »