Introduction to DoS & DDoS Attacks

8/2/2019 Introduction to DoS & DDoS Attacks

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TCIL-IT Ethical Hacker Assignment No. 3

1.What are DoS Attacks & DDoS Attacks?Ans. DOS or DDOS attacks are related to internet and networks.

DOS stands for Denial of Service and DDOS stands for

Distributed Denial of Service. In a DOS or DDOS attack the

attacker attempts to prevent the authentic users from

accessing the the web services. In both of these attacks theattackers tries to block the services by overloading the targeted

server where the web service is running.

Whenever you try to access any website you send http requests

to the server where the website is being hosted. All the web

server and the networks are capable of handling a particular

number of request per second (threshold value) if the number

of requests crosses this threshold value then the web server

goes into a non active mode where it will no more be able to

handle any http requests. At this condition the web server

virtually dies. This situation is called denial of service. Before

making a website lives, the number of users are estimated and

accordingly the hosting capacity is selected. Hence all website

has got their own limit.


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How does DOS and DDOS attack work?

In DOS attack the attacker runs a program on a system

connected to internet. This program sends multiple http

requests to the targeted server causing network blocking for

the web server. There after the authentic users will not be able

to access the website any more. When you try to open any

website under DOS or DDOS attack you will get a network

timeout error in your browser.

What is the difference DOS and DDOS attack?

In both the attacks the targeted server and network goes down.

So what is the difference between these two attacks? Actually

these two attacks are named based on the source of attack. In

DOS attack the attacker runs the program from a single

computer where as in DDOS attack the attacking program are

being run from multiple systems or from a distributed network.

In DDOS attack the attacker may use your system to attack a

different system. See the below image description for a clear

understanding of DOS and DDOS attacks:


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DoS Attack

DDoS Attack


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Techniques used for DoS Attacks:

1.This is a website DOS attacking technique done by a toolcalled rDOS. It is build to attack a website having openvulnerable port.

Here it is we have DoS Attack on a website. But this is only

educational purpose. Dont do in your real life.

2.Crazy Pinger is another tool for DoS Attack but only in LANNetwork. By this tool we can attack a PC locally. Like if we

have N/W about 192.168.1.1 to 192.168.1.30 & we are on

192.168.1.1 and we want to attack on 192.168.1.20. By

this tool 192.168.1.20 PC will be very slow and hang after


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some time and may be it will be shut down automatically.

Lets take an example.

Techniques used for DDoS Attacks:

As we read already about DDoS Attack. We have tool named

LOIC (Low Orbit Ion Cannon). This tool is used for DDoS Attack.


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Lets take an example.

But this was only for educational purpose. Don

t try it yourself.

Documents

Introduction to DoS & DDoS Attacks