Satish Tiwary's picture

Backup and Restore router configuration file using TFTP server with Packet Tracer -Cisco CCNA

This tutorial is all about Backup and Restore router configuration file using TFTP server with Packet Tracer.If you are a network admin or you are preparing for a network admin,you may face a critical problem like your router configuration get messed or you want to take complete backup of your router configuration before doing some major changes in it so that if something bad happens you can restore it back to previous mode.And if you are able to restore it back to previous mode where it was working well,it will save you from a disaster.Here in this lab i have created a scenario using cisco packet tracer in which i am going to show you how to take backup of router configuration file using TFTP SERVER and Restore back when needed.

Here you can clearly see

Sarath Pillai's picture

What is a Jumbo Frame in Ethernet

Ethernet Jumbo Frames

Ethernet is one of the core technology that enables most of our communications and data transfer that we do over the internet possible.  Its an inexpensive technology for high performance networking.

When your application (no matter what..can be a web browser, a download client etc etc) initiates a connection to a remote server, the application’s job is to transfer the data/request it wants to send to the network protocol stack.

The job of the protocol stack is to break that data down to smaller chunks and wrap it with required information, to send it through the wire. This information wrapped around the data chunks enables the data to be received by the correct receiver, and reassemble the data chunk in the correct order.

Sarath Pillai's picture

Find Network Traffic and Bandwidth usage per Process in Linux

Network Traffic Per Process in Linux

Being a system administrator, there are times when we need to check which process is taking high network bandwidth on a machine. This is not that easy to do without any standard tool designed only for that purpose. In this article we will be looking at one such tool. But before looking at that tool we will try to fetch details with other methods.


I request my readers to share any other command line techniques/tools that can be used to achieve this.


Sarath Pillai's picture

What is Anycast and How it works

Anycast and its working

If you try to access from US the request will be routed to the Linode London data center. If you try to access from Asia, again the request will be routed to the same Linode London Data Center. Take one more case, and try to access from Europe (Ireland) the request will be again routed to Linode London.


The bottom line is, You will be routed to Linode London, no matter from where you access.


There are two primary problems associated with this architecture. They are mentioned below.


Satish Tiwary's picture

How to configure a Router to work as a DHCP Server.

DHCP server configuration in router

As we know ip addresses can be assigned to a end device in two way.

  • Static
  • Dynamic

In static way network admin or system admin or user manually assigned ip address on the device, but if the number of devices are much more and you dont want to take the headache for assigning the ip addresses, then it become so teasing and time taking to manually assign ip address to every device. To solve this problem, Dynamic way of ip assigning is used.


DHCP is a protocol that is heavily used to assign IP addresses automatically over LAN networks. If you are interested in understanding how DHCP works, then refer the below blog post.


Sarath Pillai's picture

How Does Traceroute Work and Example's of using traceroute command

How does traceroute work

If you are working as a network administrator, system administrator, or in any system operations team, then you might have already heard about the tool named TRACEROUTE. Its a very handy tool available in most of the operating systems by default.


Network administrators and system administrators use this tool most commonly in their day to day activities. Its basically a network diagnostic tool that is very handy. There are three main primary objectives of traceroute tool. These objectives fulfilled by tracroute gives an insight to your network problem.


  1. The entire path that a packet travels through

Satish Tiwary's picture

RIP and EIGRP Configuration on same network

After static routing configuration, and dynamice routing configuration we are going to introduce Hybrid Routing Configuration here now. We will use RIP and EIGRP together and merge them to get the benefits of Distance vector and Link State. So when you use both RIP and EIGRP together then the most accurate metrics to determine the best path to destination automatically get changed with change in network topology.This type of routing is allowed for rapid convergence but consume less memory and lesser processing power.

Sarath Pillai's picture

Understanding and configuring DHCP

DHCP- Dynamic Host Configuration Protocol.

Suppose you have a small network and you want all the machines in the network to have an ip address,dns server address,gateway etc to be configured automatically at boot time, then DHCP can help you.

In this case the client machine is not configured with a static ip address but its configured in such a way that it goes and quries the DHCP server in the network for its IP address and other configs.

Satish Tiwary's picture

EIGRP (Enhanced Interior Gateway Routing Protocol)

eigrp tutorial


EIGRP is a Cisco proprietary routing protocol. and since  it is proprietary, one can use it only in a Cisco network which is a draw back of this routing protocol.Now have a look on the technology used in this routing protocol.Technology used in EIGRP  (Diffused Update Algorithm) is similar to Distance Vector Protocol.

Satish Tiwary's picture

routing information protocol configuration

routing information protocol

This notes is all about how to configure RIP Version 1 and Version 2  on cisco routers.

This tutorial on RIP will make CCNA studentrs works more easier.Here we see how to configure rip version 1 and rip version2 on cisco routers.This tutorial consits of configuration.debugging and troubleshooting of Routing Information Protocol.

In our previous post we have learned how to configure static route on cisco routers.


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