Category: Networking

ISP WORKSHOP on 17th Nov 2018

Follow this link for Workshop topology and commands of all tasks… Read More

Different Between Baseband and Broadband

Differentiating Between Baseband and Broadband Signaling Two types of signaling methods are used to transmit information over network media: baseband and broadband. Before we get any further into 802.3 standards we should clarify the difference between the two. Baseband Baseband transmissions typically use digital signaling over a single wire; the transmissions themselves take the form Read More


ICMP is a networking protocol developed to analyse the connectivity between source and destination hosts. The structure of ICMP datagram as follows Data (32 bytes by default) Sequence No: – Since it is sending data repeatedly, ICMP itself assings a sequence number to identify the segment of data Identifier –  It is very close to port Read More

Blazing fast failure detection – BFD (Part-1)

Actually BFD stands for Bidirectional Failure Detection, but its not catchy so I chose to call it blazing-fast failure detection. Let us understand what it does and what is so cool about it. If you had 2 routers connected to a switched network and the router needed to maintain neighbour relationship between themselves. What will Read More

Why you need NTP (Network Time Protocol)?

If you were to read news in a News paper and find out when that news took place you would look at the date of publishing on the News paper. We need an anchor, a constant, that we all agree to follow in order to relate to the events happening in our lives. similarly when we talk about IT infrastructure a good IT Engineer will also make sure he checks that time when a particular event happen. Read More

Future communication technology

We are approaching the time when we will be able to communicate faster than the speed of light. It is well known that as we approach the speed of light, time slows down. Logically, it is reasonable to assume that as we go faster than the speed of light, time will reverse. The major consequence of this for Internet protocols is that packets will arrive before they are sent. This will have a major impact on the way we design Internet protocols. This paper outlines some of the issues and suggests some directions for additional analysis of these issues. Read More

How-to change SSH port number in RHEL-7

SSH is a networking protocol used for accessing the CLI(shell) remotely with applications. In RHEL7, ssh will be by default running as a daemon service called sshd in port 22. In this blog i want to show you how to secure the ports of SSH by changing it. Read More


CDP (Cisco Discovery Protocol) is a proprietary protocol designed by Cisco System for Cisco devices. CDP helps administrators in collecting information about cisco devices. In this article we will explain CDP protocol in details. Read More

Backdoor in BGP

This article help you to understand how Backdoor option works in BGP. Generally, Backdoor is a term which  technically describes – Bypassing security mechanism to access a Resources. But in BGP it refers to a different thing. Before understanding the BGP Backdoor, We need to understand some Routing Concept and Protocols. BGP is a routing protocol Read More

Private VLAN

Private VLAN in Cisco

To divide broadcast domain we know there is a concept called VLAN. But if we are using Private VLAN we can isolate each ports connected to users in the same VLAN and still they can communicate to there up-link. Read More

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