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
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.
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.
Creating a Local YUM Repository with ISO
In Order to install or Update software in RHEL we need to connect to RHN (RedHat Network). By creating Local Repository we can install software from our own device. It saves things like bandwidth and time. All we need is an iso image (CD/DVD image). Download the iso file from redhat.com and place it in /iso directory To
Notes – Types of VPN
PPTP
This is the most common and widely used VPN protocol. They enable authorized remote users to connect to the VPN network using their existing Internet connection and then log on to the VPN using password authentication. It also doesn’t provide encryption and it relies on PPP protocol to do this.
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.
Notes – Active Directory | Domain | Domain Controller
Active Directory It is a Microsoft based service which provides Centralized Database for the domain. The database is called NTDS. Domain A Collection of Users, Computers, Groups, Servers and other network resource use common NTDS Database in an organization. This organization is called as Domain. Domain Controller A computer running with Active Directory Services that
CDP Cisco Discovery Protocol
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.
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
Difference Between Object Based NAT and Table Based NAT in Checkpoint
This article discusses about the difference between the 2 type of NAT which can be configured in the checkpoint firewall. NAT is a idea of translating IP address in the IP packet and mainly used to provide communication between Private network to Public network. This NAT can be configured in so many devices i.e. router,